Clean-up old docked-stack implementation from WM

Bug: 133381284
Test: Existing tests pass. Manually use sysui
Change-Id: I44155d74df1489fa391c60a05d1f8098986cefb7
diff --git a/services/core/java/com/android/server/am/ActivityManagerService.java b/services/core/java/com/android/server/am/ActivityManagerService.java
index cea3bb8..b2fb530 100644
--- a/services/core/java/com/android/server/am/ActivityManagerService.java
+++ b/services/core/java/com/android/server/am/ActivityManagerService.java
@@ -6515,14 +6515,6 @@
     }
 
     @Override
-    public void resizeDockedStack(Rect dockedBounds, Rect tempDockedTaskBounds,
-            Rect tempDockedTaskInsetBounds,
-            Rect tempOtherTaskBounds, Rect tempOtherTaskInsetBounds) {
-        mActivityTaskManager.resizeDockedStack(dockedBounds, tempDockedTaskBounds,
-                tempDockedTaskInsetBounds, tempOtherTaskBounds, tempOtherTaskInsetBounds);
-    }
-
-    @Override
     public void positionTaskInStack(int taskId, int stackId, int position) {
         mActivityTaskManager.positionTaskInStack(taskId, stackId, position);
     }
diff --git a/services/core/java/com/android/server/am/ActivityManagerShellCommand.java b/services/core/java/com/android/server/am/ActivityManagerShellCommand.java
index bf79729..2941e77 100644
--- a/services/core/java/com/android/server/am/ActivityManagerShellCommand.java
+++ b/services/core/java/com/android/server/am/ActivityManagerShellCommand.java
@@ -2570,8 +2570,6 @@
         switch (op) {
             case "move-task":
                 return runStackMoveTask(pw);
-            case "resize-docked-stack":
-                return runStackResizeDocked(pw);
             case "positiontask":
                 return runStackPositionTask(pw);
             case "list":
@@ -2646,17 +2644,6 @@
         return 0;
     }
 
-    int runStackResizeDocked(PrintWriter pw) throws RemoteException {
-        final Rect bounds = getBounds();
-        final Rect taskBounds = getBounds();
-        if (bounds == null || taskBounds == null) {
-            getErrPrintWriter().println("Error: invalid input bounds");
-            return -1;
-        }
-        mTaskInterface.resizeDockedStack(bounds, taskBounds, null, null, null);
-        return 0;
-    }
-
     int runStackPositionTask(PrintWriter pw) throws RemoteException {
         String taskIdStr = getNextArgRequired();
         int taskId = Integer.parseInt(taskIdStr);
diff --git a/services/core/java/com/android/server/wm/ActivityRecord.java b/services/core/java/com/android/server/wm/ActivityRecord.java
index d715ed4..787785b 100644
--- a/services/core/java/com/android/server/wm/ActivityRecord.java
+++ b/services/core/java/com/android/server/wm/ActivityRecord.java
@@ -4198,13 +4198,6 @@
         final DisplayContent displayContent = getDisplayContent();
         if (!displayContent.mClosingApps.contains(this)
                 && !displayContent.mOpeningApps.contains(this)) {
-            // The token is not closing nor opening, so even if there is an animation set, that
-            // doesn't mean that it goes through the normal app transition cycle so we have
-            // to inform the docked controller about visibility change.
-            // TODO(multi-display): notify docked divider on all displays where visibility was
-            // affected.
-            displayContent.getDockedDividerController().notifyAppVisibilityChanged();
-
             // Take the screenshot before possibly hiding the WSA, otherwise the screenshot
             // will not be taken.
             mWmService.mTaskSnapshotController.notifyAppVisibilityChanged(this, visible);
diff --git a/services/core/java/com/android/server/wm/ActivityStack.java b/services/core/java/com/android/server/wm/ActivityStack.java
index ff890ff..84848b4 100644
--- a/services/core/java/com/android/server/wm/ActivityStack.java
+++ b/services/core/java/com/android/server/wm/ActivityStack.java
@@ -17,8 +17,6 @@
 package com.android.server.wm;
 
 import static android.app.ActivityTaskManager.INVALID_TASK_ID;
-import static android.app.ActivityTaskManager.SPLIT_SCREEN_CREATE_MODE_BOTTOM_OR_RIGHT;
-import static android.app.ActivityTaskManager.SPLIT_SCREEN_CREATE_MODE_TOP_OR_LEFT;
 import static android.app.ITaskStackListener.FORCED_RESIZEABLE_REASON_SPLIT_SCREEN;
 import static android.app.WindowConfiguration.ACTIVITY_TYPE_ASSISTANT;
 import static android.app.WindowConfiguration.ACTIVITY_TYPE_HOME;
@@ -39,16 +37,10 @@
 import static android.content.pm.ActivityInfo.FLAG_RESUME_WHILE_PAUSING;
 import static android.content.pm.ActivityInfo.FLAG_SHOW_FOR_ALL_USERS;
 import static android.content.pm.ActivityInfo.SCREEN_ORIENTATION_UNSET;
-import static android.content.res.Configuration.ORIENTATION_PORTRAIT;
 import static android.os.Trace.TRACE_TAG_WINDOW_MANAGER;
 import static android.view.Display.DEFAULT_DISPLAY;
 import static android.view.Display.FLAG_CAN_SHOW_WITH_INSECURE_KEYGUARD;
 import static android.view.Display.INVALID_DISPLAY;
-import static android.view.WindowManager.DOCKED_BOTTOM;
-import static android.view.WindowManager.DOCKED_INVALID;
-import static android.view.WindowManager.DOCKED_LEFT;
-import static android.view.WindowManager.DOCKED_RIGHT;
-import static android.view.WindowManager.DOCKED_TOP;
 import static android.view.WindowManager.TRANSIT_ACTIVITY_CLOSE;
 import static android.view.WindowManager.TRANSIT_ACTIVITY_OPEN;
 import static android.view.WindowManager.TRANSIT_CRASHING_ACTIVITY_CLOSE;
@@ -98,13 +90,8 @@
 import static com.android.server.wm.ActivityTaskManagerService.H.FIRST_ACTIVITY_STACK_MSG;
 import static com.android.server.wm.ActivityTaskManagerService.RELAUNCH_REASON_FREE_RESIZE;
 import static com.android.server.wm.ActivityTaskManagerService.RELAUNCH_REASON_WINDOWING_MODE_RESIZE;
-import static com.android.server.wm.DragResizeMode.DRAG_RESIZE_MODE_DOCKED_DIVIDER;
 import static com.android.server.wm.TaskProto.ACTIVITIES;
 import static com.android.server.wm.TaskProto.ACTIVITY_TYPE;
-import static com.android.server.wm.TaskProto.ADJUSTED_BOUNDS;
-import static com.android.server.wm.TaskProto.ADJUSTED_FOR_IME;
-import static com.android.server.wm.TaskProto.ADJUST_DIVIDER_AMOUNT;
-import static com.android.server.wm.TaskProto.ADJUST_IME_AMOUNT;
 import static com.android.server.wm.TaskProto.ANIMATING_BOUNDS;
 import static com.android.server.wm.TaskProto.BOUNDS;
 import static com.android.server.wm.TaskProto.CREATED_BY_ORGANIZER;
@@ -113,7 +100,6 @@
 import static com.android.server.wm.TaskProto.DISPLAY_ID;
 import static com.android.server.wm.TaskProto.FILLS_PARENT;
 import static com.android.server.wm.TaskProto.LAST_NON_FULLSCREEN_BOUNDS;
-import static com.android.server.wm.TaskProto.MINIMIZE_AMOUNT;
 import static com.android.server.wm.TaskProto.MIN_HEIGHT;
 import static com.android.server.wm.TaskProto.MIN_WIDTH;
 import static com.android.server.wm.TaskProto.ORIG_ACTIVITY;
@@ -168,7 +154,6 @@
 import android.util.Slog;
 import android.util.proto.ProtoOutputStream;
 import android.view.Display;
-import android.view.DisplayCutout;
 import android.view.DisplayInfo;
 import android.view.ITaskOrganizer;
 import android.view.SurfaceControl;
@@ -177,8 +162,6 @@
 import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.app.IVoiceInteractor;
 import com.android.internal.os.logging.MetricsLoggerWrapper;
-import com.android.internal.policy.DividerSnapAlgorithm;
-import com.android.internal.policy.DockedDividerUtils;
 import com.android.internal.util.function.pooled.PooledConsumer;
 import com.android.internal.util.function.pooled.PooledFunction;
 import com.android.internal.util.function.pooled.PooledLambda;
@@ -238,13 +221,6 @@
     /** Stack is completely invisible. */
     static final int STACK_VISIBILITY_INVISIBLE = 2;
 
-    /** Minimum size of an adjusted stack bounds relative to original stack bounds. Used to
-     * restrict IME adjustment so that a min portion of top stack remains visible.*/
-    private static final float ADJUSTED_STACK_FRACTION_MIN = 0.3f;
-
-    /** Dimming amount for non-focused stack when stacks are IME-adjusted. */
-    private static final float IME_ADJUST_DIM_AMOUNT = 0.25f;
-
     enum ActivityState {
         INITIALIZING,
         STARTED,
@@ -294,28 +270,10 @@
     /** For Pinned stack controlling. */
     private Rect mTmpToBounds = new Rect();
 
-    /** Stack bounds adjusted to screen content area (taking into account IM windows, etc.) */
-    private final Rect mAdjustedBounds = new Rect();
-
-    /**
-     * Fully adjusted IME bounds. These are different from {@link #mAdjustedBounds} because they
-     * represent the state when the animation has ended.
-     */
-    private final Rect mFullyAdjustedImeBounds = new Rect();
-
     /** Detach this stack from its display when animation completes. */
     // TODO: maybe tie this to WindowContainer#removeChild some how...
     private boolean mDeferRemoval;
 
-    private final Rect mTmpAdjustedBounds = new Rect();
-    private boolean mAdjustedForIme;
-    private boolean mImeGoingAway;
-    private WindowState mImeWin;
-    private float mMinimizeAmount;
-    private float mAdjustImeAmount;
-    private float mAdjustDividerAmount;
-    private final int mDockedStackMinimizeThickness;
-
     // If this is true, we are in the bounds animating mode. The task will be down or upscaled to
     // perfectly fit the region it would have been cropped to. We may also avoid certain logic we
     // would otherwise apply while resizing, while resizing in the bounds animating mode.
@@ -643,8 +601,6 @@
                 _realActivitySuspended, userSetupComplete, minWidth, minHeight, info, _voiceSession,
                 _voiceInteractor, stack);
 
-        mDockedStackMinimizeThickness = mWmService.mContext.getResources().getDimensionPixelSize(
-                com.android.internal.R.dimen.docked_stack_minimize_thickness);
         EventLogTags.writeWmStackCreated(id);
         mHandler = new ActivityStackHandler(mStackSupervisor.mLooper);
         mCurrentUser = mAtmService.mAmInternal.getCurrentUserId();
@@ -3497,43 +3453,6 @@
         forAllLeafTasks(Task::prepareFreezingBounds, true /* traverseTopToBottom */);
     }
 
-    /**
-     * Overrides the adjusted bounds, i.e. sets temporary layout bounds which are different from
-     * the normal task bounds.
-     *
-     * @param bounds The adjusted bounds.
-     */
-    private void setAdjustedBounds(Rect bounds) {
-        if (mAdjustedBounds.equals(bounds) && !isAnimatingForIme()) {
-            return;
-        }
-
-        mAdjustedBounds.set(bounds);
-        final boolean adjusted = !mAdjustedBounds.isEmpty();
-        Rect insetBounds = null;
-        if (adjusted && isAdjustedForMinimizedDockedStack()) {
-            insetBounds = getRawBounds();
-        } else if (adjusted && mAdjustedForIme) {
-            if (mImeGoingAway) {
-                insetBounds = getRawBounds();
-            } else {
-                insetBounds = mFullyAdjustedImeBounds;
-            }
-        }
-
-        if (!matchParentBounds()) {
-            final boolean alignBottom = mAdjustedForIme && getDockSide() == DOCKED_TOP;
-            final PooledConsumer c = PooledLambda.obtainConsumer(Task::alignToAdjustedBounds,
-                    PooledLambda.__(Task.class), adjusted ? mAdjustedBounds : getRawBounds(),
-                    insetBounds, alignBottom);
-            forAllLeafTasks(c, true /* traverseTopToBottom */);
-            c.recycle();
-        }
-
-        mDisplayContent.setLayoutNeeded();
-        updateSurfaceBounds();
-    }
-
     @Override
     public int setBounds(Rect bounds) {
         // Calling Task#setBounds() for leaf task since this is the a specialization of
@@ -3552,8 +3471,6 @@
 
         final int result = super.setBounds(!inMultiWindowMode() ? null : bounds);
 
-        updateAdjustedBounds();
-
         updateSurfaceBounds();
         return result;
     }
@@ -3575,19 +3492,6 @@
         bounds.set(getBounds());
     }
 
-    @Override
-    public Rect getBounds() {
-        // If we're currently adjusting for IME or minimized docked stack, we use the adjusted
-        // bounds; otherwise, no need to adjust the output bounds if fullscreen or the docked
-        // stack is visible since it is already what we want to represent to the rest of the
-        // system.
-        if (!mAdjustedBounds.isEmpty()) {
-            return mAdjustedBounds;
-        } else {
-            return super.getBounds();
-        }
-    }
-
     /**
      * @return the final bounds for the bounds animation.
      */
@@ -3620,113 +3524,6 @@
     }
 
     /**
-     * Updates the passed-in {@code inOutBounds} based on the current state of the
-     * docked controller. This gets run *after* the override configuration is updated, so it's
-     * safe to rely on the controller's state in here (though eventually this dependence should
-     * be removed).
-     *
-     * This does NOT modify this TaskStack's configuration. However, it does, for the time-being,
-     * update docked controller state.
-     *
-     * @param parentConfig the parent configuration for reference.
-     * @param inOutBounds the bounds to update (both input and output).
-     */
-    void calculateDockedBoundsForConfigChange(Configuration parentConfig, Rect inOutBounds) {
-        final boolean primary =
-                getRequestedOverrideWindowingMode() == WINDOWING_MODE_SPLIT_SCREEN_PRIMARY;
-        repositionSplitScreenStackAfterRotation(parentConfig, primary, inOutBounds);
-        final DisplayCutout cutout = mDisplayContent.getDisplayInfo().displayCutout;
-        snapDockedStackAfterRotation(parentConfig, cutout, inOutBounds);
-        if (primary) {
-            final int newDockSide = getDockSide(parentConfig, inOutBounds);
-            // Update the dock create mode and clear the dock create bounds, these
-            // might change after a rotation and the original values will be invalid.
-            mWmService.setDockedStackCreateStateLocked(
-                    (newDockSide == DOCKED_LEFT || newDockSide == DOCKED_TOP)
-                            ? SPLIT_SCREEN_CREATE_MODE_TOP_OR_LEFT
-                            : SPLIT_SCREEN_CREATE_MODE_BOTTOM_OR_RIGHT,
-                    null);
-            mDisplayContent.getDockedDividerController().notifyDockSideChanged(newDockSide);
-        }
-    }
-
-    /**
-     * Some primary split screen sides are not allowed by the policy. This method queries the policy
-     * and moves the primary stack around if needed.
-     *
-     * @param parentConfig the configuration of the stack's parent.
-     * @param primary true if adjusting the primary docked stack, false for secondary.
-     * @param inOutBounds the bounds of the stack to adjust.
-     */
-    void repositionSplitScreenStackAfterRotation(Configuration parentConfig, boolean primary,
-            Rect inOutBounds) {
-        final int dockSide = getDockSide(mDisplayContent, parentConfig, inOutBounds);
-        final int otherDockSide = DockedDividerUtils.invertDockSide(dockSide);
-        final int primaryDockSide = primary ? dockSide : otherDockSide;
-        if (mDisplayContent.getDockedDividerController()
-                .canPrimaryStackDockTo(primaryDockSide,
-                        parentConfig.windowConfiguration.getBounds(),
-                        parentConfig.windowConfiguration.getRotation())) {
-            return;
-        }
-        final Rect parentBounds = parentConfig.windowConfiguration.getBounds();
-        switch (otherDockSide) {
-            case DOCKED_LEFT:
-                int movement = inOutBounds.left;
-                inOutBounds.left -= movement;
-                inOutBounds.right -= movement;
-                break;
-            case DOCKED_RIGHT:
-                movement = parentBounds.right - inOutBounds.right;
-                inOutBounds.left += movement;
-                inOutBounds.right += movement;
-                break;
-            case DOCKED_TOP:
-                movement = inOutBounds.top;
-                inOutBounds.top -= movement;
-                inOutBounds.bottom -= movement;
-                break;
-            case DOCKED_BOTTOM:
-                movement = parentBounds.bottom - inOutBounds.bottom;
-                inOutBounds.top += movement;
-                inOutBounds.bottom += movement;
-                break;
-        }
-    }
-
-    /**
-     * Snaps the bounds after rotation to the closest snap target for the docked stack.
-     */
-    void snapDockedStackAfterRotation(Configuration parentConfig, DisplayCutout displayCutout,
-            Rect outBounds) {
-
-        // Calculate the current position.
-        final int dividerSize = mDisplayContent.getDockedDividerController().getContentWidth();
-        final int dockSide = getDockSide(parentConfig, outBounds);
-        final int dividerPosition = DockedDividerUtils.calculatePositionForBounds(outBounds,
-                dockSide, dividerSize);
-        final int displayWidth = parentConfig.windowConfiguration.getBounds().width();
-        final int displayHeight = parentConfig.windowConfiguration.getBounds().height();
-
-        // Snap the position to a target.
-        final int rotation = parentConfig.windowConfiguration.getRotation();
-        final int orientation = parentConfig.orientation;
-        mDisplayContent.getDisplayPolicy().getStableInsetsLw(rotation, displayWidth, displayHeight,
-                displayCutout, outBounds);
-        final DividerSnapAlgorithm algorithm = new DividerSnapAlgorithm(
-                mWmService.mContext.getResources(), displayWidth, displayHeight,
-                dividerSize, orientation == Configuration.ORIENTATION_PORTRAIT, outBounds,
-                getDockSide(), isMinimizedDockAndHomeStackResizable());
-        final DividerSnapAlgorithm.SnapTarget target =
-                algorithm.calculateNonDismissingSnapTarget(dividerPosition);
-
-        // Recalculate the bounds based on the position of the target.
-        DockedDividerUtils.calculateBoundsForPosition(target.position, dockSide,
-                outBounds, displayWidth, displayHeight,
-                dividerSize);
-    }
-
-    /**
      * Put a Task in this stack. Used for adding only.
      * When task is added to top of the stack, the entire branch of the hierarchy (including stack
      * and display) will be brought to top.
@@ -3916,445 +3713,8 @@
         }
     }
 
-    /**
-     * Determines the stack and task bounds of the other stack when in docked mode. The current task
-     * bounds is passed in but depending on the stack, the task and stack must match. Only in
-     * minimized mode with resizable launcher, the other stack ignores calculating the stack bounds
-     * and uses the task bounds passed in as the stack and task bounds, otherwise the stack bounds
-     * is calculated and is also used for its task bounds.
-     * If any of the out bounds are empty, it represents default bounds
-     *
-     * @param currentTempTaskBounds the current task bounds of the other stack
-     * @param outStackBounds the calculated stack bounds of the other stack
-     * @param outTempTaskBounds the calculated task bounds of the other stack
-     */
-    void getStackDockedModeBounds(Rect dockedBounds,
-            Rect currentTempTaskBounds, Rect outStackBounds, Rect outTempTaskBounds) {
-        final Configuration parentConfig = getParent().getConfiguration();
-        outTempTaskBounds.setEmpty();
-
-        if (dockedBounds == null || dockedBounds.isEmpty()) {
-            // Calculate the primary docked bounds.
-            final boolean dockedOnTopOrLeft = mWmService.mDockedStackCreateMode
-                    == SPLIT_SCREEN_CREATE_MODE_TOP_OR_LEFT;
-            getStackDockedModeBounds(parentConfig,
-                    true /* primary */, outStackBounds, dockedBounds,
-                    mDisplayContent.mDividerControllerLocked.getContentWidth(), dockedOnTopOrLeft);
-            return;
-        }
-        final int dockedSide = getDockSide(parentConfig, dockedBounds);
-
-        // When the home stack is resizable, should always have the same stack and task bounds
-        if (isActivityTypeHome()) {
-            final Task homeTask = getTopMostTask();
-            if (homeTask == null || homeTask.isResizeable()) {
-                // Calculate the home stack bounds when in docked mode and the home stack is
-                // resizeable.
-                getDisplayContent().mDividerControllerLocked
-                        .getHomeStackBoundsInDockedMode(parentConfig,
-                                dockedSide, outStackBounds);
-            } else {
-                // Home stack isn't resizeable, so don't specify stack bounds.
-                outStackBounds.setEmpty();
-            }
-
-            outTempTaskBounds.set(outStackBounds);
-            return;
-        }
-
-        // When minimized state, the stack bounds for all non-home and docked stack bounds should
-        // match the passed task bounds
-        if (isMinimizedDockAndHomeStackResizable() && currentTempTaskBounds != null) {
-            outStackBounds.set(currentTempTaskBounds);
-            return;
-        }
-
-        if (dockedSide == DOCKED_INVALID) {
-            // Not sure how you got here...Only thing we can do is return current bounds.
-            Slog.e(TAG_WM, "Failed to get valid docked side for docked stack");
-            outStackBounds.set(getRawBounds());
-            return;
-        }
-
-        final boolean dockedOnTopOrLeft = dockedSide == DOCKED_TOP || dockedSide == DOCKED_LEFT;
-        getStackDockedModeBounds(parentConfig,
-                false /* primary */, outStackBounds, dockedBounds,
-                mDisplayContent.mDividerControllerLocked.getContentWidth(), dockedOnTopOrLeft);
-    }
-
-    /**
-     * Outputs the bounds a stack should be given the presence of a docked stack on the display.
-     * @param parentConfig The parent configuration.
-     * @param primary {@code true} if getting the primary stack bounds.
-     * @param outBounds Output bounds that should be used for the stack.
-     * @param dockedBounds Bounds of the docked stack.
-     * @param dockDividerWidth We need to know the width of the divider make to the output bounds
-     *                         close to the side of the dock.
-     * @param dockOnTopOrLeft If the docked stack is on the top or left side of the screen.
-     */
-    private void getStackDockedModeBounds(Configuration parentConfig, boolean primary,
-            Rect outBounds, Rect dockedBounds, int dockDividerWidth,
-            boolean dockOnTopOrLeft) {
-        final Rect displayRect = parentConfig.windowConfiguration.getBounds();
-        final boolean splitHorizontally = displayRect.width() > displayRect.height();
-
-        outBounds.set(displayRect);
-        if (primary) {
-            if (mWmService.mDockedStackCreateBounds != null) {
-                outBounds.set(mWmService.mDockedStackCreateBounds);
-                return;
-            }
-
-            // The initial bounds of the docked stack when it is created about half the screen space
-            // and its bounds can be adjusted after that. The bounds of all other stacks are
-            // adjusted to occupy whatever screen space the docked stack isn't occupying.
-            final DisplayCutout displayCutout = mDisplayContent.getDisplayInfo().displayCutout;
-            mDisplayContent.getDisplayPolicy().getStableInsetsLw(
-                    parentConfig.windowConfiguration.getRotation(),
-                    displayRect.width(), displayRect.height(), displayCutout, mTmpRect2);
-            final int position = new DividerSnapAlgorithm(mWmService.mContext.getResources(),
-                    displayRect.width(),
-                    displayRect.height(),
-                    dockDividerWidth,
-                    parentConfig.orientation == ORIENTATION_PORTRAIT,
-                    mTmpRect2).getMiddleTarget().position;
-
-            if (dockOnTopOrLeft) {
-                if (splitHorizontally) {
-                    outBounds.right = position;
-                } else {
-                    outBounds.bottom = position;
-                }
-            } else {
-                if (splitHorizontally) {
-                    outBounds.left = position + dockDividerWidth;
-                } else {
-                    outBounds.top = position + dockDividerWidth;
-                }
-            }
-            return;
-        }
-
-        // Other stacks occupy whatever space is left by the docked stack.
-        if (!dockOnTopOrLeft) {
-            if (splitHorizontally) {
-                outBounds.right = dockedBounds.left - dockDividerWidth;
-            } else {
-                outBounds.bottom = dockedBounds.top - dockDividerWidth;
-            }
-        } else {
-            if (splitHorizontally) {
-                outBounds.left = dockedBounds.right + dockDividerWidth;
-            } else {
-                outBounds.top = dockedBounds.bottom + dockDividerWidth;
-            }
-        }
-        DockedDividerUtils.sanitizeStackBounds(outBounds, !dockOnTopOrLeft);
-    }
-
-    void resetDockedStackToMiddle() {
-        if (!inSplitScreenPrimaryWindowingMode()) {
-            throw new IllegalStateException("Not a docked stack=" + this);
-        }
-
-        mWmService.mDockedStackCreateBounds = null;
-
-        final Rect bounds = new Rect();
-        final Rect tempBounds = new Rect();
-        getStackDockedModeBounds(null /* dockedBounds */, null /* currentTempTaskBounds */,
-                bounds, tempBounds);
-        mStackSupervisor.resizeDockedStackLocked(bounds, null /* tempTaskBounds */,
-                null /* tempTaskInsetBounds */, null /* tempOtherTaskBounds */,
-                null /* tempOtherTaskInsetBounds */, false /* preserveWindows */,
-                false /* deferResume */);
-    }
-
-    /**
-     * Adjusts the stack bounds if the IME is visible.
-     *
-     * @param imeWin The IME window.
-     * @param keepLastAmount Use {@code true} to keep the last adjusted amount from
-     *                       {@link DockedStackDividerController} for adjusting the stack bounds,
-     *                       Use {@code false} to reset adjusted amount as 0.
-     * @see #updateAdjustForIme(float, float, boolean)
-     */
-    void setAdjustedForIme(WindowState imeWin, boolean keepLastAmount) {
-        mImeWin = imeWin;
-        mImeGoingAway = false;
-        if (!mAdjustedForIme || keepLastAmount) {
-            mAdjustedForIme = true;
-            DockedStackDividerController controller = getDisplayContent().mDividerControllerLocked;
-            final float adjustImeAmount = keepLastAmount ? controller.mLastAnimationProgress : 0f;
-            final float adjustDividerAmount = keepLastAmount ? controller.mLastDividerProgress : 0f;
-            updateAdjustForIme(adjustImeAmount, adjustDividerAmount, true /* force */);
-        }
-    }
-
-    boolean isAdjustedForIme() {
-        return mAdjustedForIme;
-    }
-
-    boolean isAnimatingForIme() {
-        return mImeWin != null && mImeWin.isAnimatingLw();
-    }
-
-    /**
-     * Update the stack's bounds (crop or position) according to the IME window's
-     * current position. When IME window is animated, the bottom stack is animated
-     * together to track the IME window's current position, and the top stack is
-     * cropped as necessary.
-     *
-     * @return true if a traversal should be performed after the adjustment.
-     */
-    boolean updateAdjustForIme(float adjustAmount, float adjustDividerAmount, boolean force) {
-        if (adjustAmount != mAdjustImeAmount
-                || adjustDividerAmount != mAdjustDividerAmount || force) {
-            mAdjustImeAmount = adjustAmount;
-            mAdjustDividerAmount = adjustDividerAmount;
-            updateAdjustedBounds();
-            return isVisible();
-        } else {
-            return false;
-        }
-    }
-
-    /**
-     * Resets the adjustment after it got adjusted for the IME.
-     * @param adjustBoundsNow if true, reset and update the bounds immediately and forget about
-     *                        animations; otherwise, set flag and animates the window away together
-     *                        with IME window.
-     */
-    void resetAdjustedForIme(boolean adjustBoundsNow) {
-        if (adjustBoundsNow) {
-            mImeWin = null;
-            mImeGoingAway = false;
-            mAdjustImeAmount = 0f;
-            mAdjustDividerAmount = 0f;
-            if (!mAdjustedForIme) {
-                return;
-            }
-            mAdjustedForIme = false;
-            updateAdjustedBounds();
-            mWmService.setResizeDimLayer(false, getWindowingMode(), 1.0f);
-        } else {
-            mImeGoingAway |= mAdjustedForIme;
-        }
-    }
-
-    /**
-     * Sets the amount how much we currently minimize our stack.
-     *
-     * @param minimizeAmount The amount, between 0 and 1.
-     * @return Whether the amount has changed and a layout is needed.
-     */
-    boolean setAdjustedForMinimizedDock(float minimizeAmount) {
-        if (minimizeAmount != mMinimizeAmount) {
-            mMinimizeAmount = minimizeAmount;
-            updateAdjustedBounds();
-            return isVisible();
-        } else {
-            return false;
-        }
-    }
-
     boolean shouldIgnoreInput() {
-        return isAdjustedForMinimizedDockedStack()
-                || (inSplitScreenPrimaryWindowingMode() && isMinimizedDockAndHomeStackResizable());
-    }
-
-    /**
-     * Puts all visible tasks that are adjusted for IME into resizing mode and adds the windows
-     * to the list of to be drawn windows the service is waiting for.
-     */
-    void beginImeAdjustAnimation() {
-        forAllLeafTasks((t) -> {
-            if (t.hasContentToDisplay()) {
-                t.setDragResizing(true, DRAG_RESIZE_MODE_DOCKED_DIVIDER);
-                t.setWaitingForDrawnIfResizingChanged();
-            }
-        }, true /* traverseTopToBottom */);
-    }
-
-    /** Resets the resizing state of all windows. */
-    void endImeAdjustAnimation() {
-        forAllLeafTasks((t) -> {
-            t.setDragResizing(false, DRAG_RESIZE_MODE_DOCKED_DIVIDER);
-        }, true /* traverseTopToBottom */);
-    }
-
-    private int getMinTopStackBottom(final Rect displayContentRect, int originalStackBottom) {
-        return displayContentRect.top + (int)
-                ((originalStackBottom - displayContentRect.top) * ADJUSTED_STACK_FRACTION_MIN);
-    }
-
-    private boolean adjustForIME(final WindowState imeWin) {
-        // To prevent task stack resize animation may flicking when playing app transition
-        // animation & IME window enter animation in parallel, we need to make sure app
-        // transition is done and then adjust task size for IME, skip the new adjusted frame when
-        // app transition is still running.
-        if (getDisplayContent().mAppTransition.isRunning()) {
-            return false;
-        }
-
-        final int dockedSide = getDockSide();
-        final boolean dockedTopOrBottom = dockedSide == DOCKED_TOP || dockedSide == DOCKED_BOTTOM;
-        if (imeWin == null || !dockedTopOrBottom) {
-            return false;
-        }
-
-        final Rect displayStableRect = mTmpRect;
-        final Rect contentBounds = mTmpRect2;
-
-        // Calculate the content bounds excluding the area occupied by IME
-        getDisplayContent().getStableRect(displayStableRect);
-        contentBounds.set(displayStableRect);
-        int imeTop = Math.max(imeWin.getFrameLw().top, contentBounds.top);
-
-        imeTop += imeWin.getGivenContentInsetsLw().top;
-        if (contentBounds.bottom > imeTop) {
-            contentBounds.bottom = imeTop;
-        }
-
-        final int yOffset = displayStableRect.bottom - contentBounds.bottom;
-
-        final int dividerWidth =
-                getDisplayContent().mDividerControllerLocked.getContentWidth();
-        final int dividerWidthInactive =
-                getDisplayContent().mDividerControllerLocked.getContentWidthInactive();
-
-        if (dockedSide == DOCKED_TOP) {
-            // If this stack is docked on top, we make it smaller so the bottom stack is not
-            // occluded by IME. We shift its bottom up by the height of the IME, but
-            // leaves at least 30% of the top stack visible.
-            final int minTopStackBottom =
-                    getMinTopStackBottom(displayStableRect, getRawBounds().bottom);
-            final int bottom = Math.max(
-                    getRawBounds().bottom - yOffset + dividerWidth - dividerWidthInactive,
-                    minTopStackBottom);
-            mTmpAdjustedBounds.set(getRawBounds());
-            mTmpAdjustedBounds.bottom = (int) (mAdjustImeAmount * bottom + (1 - mAdjustImeAmount)
-                    * getRawBounds().bottom);
-            mFullyAdjustedImeBounds.set(getRawBounds());
-        } else {
-            // When the stack is on bottom and has no focus, it's only adjusted for divider width.
-            final int dividerWidthDelta = dividerWidthInactive - dividerWidth;
-
-            // When the stack is on bottom and has focus, it needs to be moved up so as to
-            // not occluded by IME, and at the same time adjusted for divider width.
-            // We try to move it up by the height of the IME window, but only to the extent
-            // that leaves at least 30% of the top stack visible.
-            // 'top' is where the top of bottom stack will move to in this case.
-            final int topBeforeImeAdjust =
-                    getRawBounds().top - dividerWidth + dividerWidthInactive;
-            final int minTopStackBottom =
-                    getMinTopStackBottom(displayStableRect,
-                            getRawBounds().top - dividerWidth);
-            final int top = Math.max(
-                    getRawBounds().top - yOffset, minTopStackBottom + dividerWidthInactive);
-
-            mTmpAdjustedBounds.set(getRawBounds());
-            // Account for the adjustment for IME and divider width separately.
-            // (top - topBeforeImeAdjust) is the amount of movement due to IME only,
-            // and dividerWidthDelta is due to divider width change only.
-            mTmpAdjustedBounds.top =
-                    getRawBounds().top + (int) (mAdjustImeAmount * (top - topBeforeImeAdjust)
-                            + mAdjustDividerAmount * dividerWidthDelta);
-            mFullyAdjustedImeBounds.set(getRawBounds());
-            mFullyAdjustedImeBounds.top = top;
-            mFullyAdjustedImeBounds.bottom = top + getRawBounds().height();
-        }
-        return true;
-    }
-
-    private boolean adjustForMinimizedDockedStack(float minimizeAmount) {
-        final int dockSide = getDockSide();
-        if (dockSide == DOCKED_INVALID && !mTmpAdjustedBounds.isEmpty()) {
-            return false;
-        }
-
-        if (dockSide == DOCKED_TOP) {
-            mWmService.getStableInsetsLocked(DEFAULT_DISPLAY, mTmpRect);
-            int topInset = mTmpRect.top;
-            mTmpAdjustedBounds.set(getRawBounds());
-            mTmpAdjustedBounds.bottom = (int) (minimizeAmount * topInset + (1 - minimizeAmount)
-                    * getRawBounds().bottom);
-        } else if (dockSide == DOCKED_LEFT) {
-            mTmpAdjustedBounds.set(getRawBounds());
-            final int width = getRawBounds().width();
-            mTmpAdjustedBounds.right =
-                    (int) (minimizeAmount * mDockedStackMinimizeThickness
-                            + (1 - minimizeAmount) * getRawBounds().right);
-            mTmpAdjustedBounds.left = mTmpAdjustedBounds.right - width;
-        } else if (dockSide == DOCKED_RIGHT) {
-            mTmpAdjustedBounds.set(getRawBounds());
-            mTmpAdjustedBounds.left =
-                    (int) (minimizeAmount * (getRawBounds().right - mDockedStackMinimizeThickness)
-                            + (1 - minimizeAmount) * getRawBounds().left);
-        }
-        return true;
-    }
-
-    boolean isMinimizedDockAndHomeStackResizable() {
-        return mDisplayContent.mDividerControllerLocked.isMinimizedDock()
-                && mDisplayContent.mDividerControllerLocked.isHomeStackResizable();
-    }
-
-    /**
-     * @return the distance in pixels how much the stack gets minimized from it's original size
-     */
-    int getMinimizeDistance() {
-        final int dockSide = getDockSide();
-        if (dockSide == DOCKED_INVALID) {
-            return 0;
-        }
-
-        if (dockSide == DOCKED_TOP) {
-            mWmService.getStableInsetsLocked(DEFAULT_DISPLAY, mTmpRect);
-            int topInset = mTmpRect.top;
-            return getRawBounds().bottom - topInset;
-        } else if (dockSide == DOCKED_LEFT || dockSide == DOCKED_RIGHT) {
-            return getRawBounds().width() - mDockedStackMinimizeThickness;
-        } else {
-            return 0;
-        }
-    }
-
-    /**
-     * Updates the adjustment depending on it's current state.
-     */
-    private void updateAdjustedBounds() {
-        boolean adjust = false;
-        if (mMinimizeAmount != 0f) {
-            adjust = adjustForMinimizedDockedStack(mMinimizeAmount);
-        } else if (mAdjustedForIme) {
-            adjust = adjustForIME(mImeWin);
-        }
-        if (!adjust) {
-            mTmpAdjustedBounds.setEmpty();
-        }
-        setAdjustedBounds(mTmpAdjustedBounds);
-
-        final boolean isImeTarget = (mWmService.getImeFocusStackLocked() == this);
-        if (mAdjustedForIme && adjust && !isImeTarget) {
-            final float alpha = Math.max(mAdjustImeAmount, mAdjustDividerAmount)
-                    * IME_ADJUST_DIM_AMOUNT;
-            mWmService.setResizeDimLayer(true, getWindowingMode(), alpha);
-        }
-    }
-
-    void applyAdjustForImeIfNeeded(Task task) {
-        if (mMinimizeAmount != 0f || !mAdjustedForIme || mAdjustedBounds.isEmpty()) {
-            return;
-        }
-
-        final Rect insetBounds = mImeGoingAway ? getRawBounds() : mFullyAdjustedImeBounds;
-        task.alignToAdjustedBounds(mAdjustedBounds, insetBounds, getDockSide() == DOCKED_TOP);
-        mDisplayContent.setLayoutNeeded();
-    }
-
-
-    boolean isAdjustedForMinimizedDockedStack() {
-        return mMinimizeAmount != 0f;
+        return inSplitScreenPrimaryWindowingMode() && !isFocusable();
     }
 
     @Override
@@ -4362,17 +3722,6 @@
         pw.println(prefix + "mStackId=" + getRootTaskId());
         pw.println(prefix + "mDeferRemoval=" + mDeferRemoval);
         pw.println(prefix + "mBounds=" + getRawBounds().toShortString());
-        if (mMinimizeAmount != 0f) {
-            pw.println(prefix + "mMinimizeAmount=" + mMinimizeAmount);
-        }
-        if (mAdjustedForIme) {
-            pw.println(prefix + "mAdjustedForIme=true");
-            pw.println(prefix + "mAdjustImeAmount=" + mAdjustImeAmount);
-            pw.println(prefix + "mAdjustDividerAmount=" + mAdjustDividerAmount);
-        }
-        if (!mAdjustedBounds.isEmpty()) {
-            pw.println(prefix + "mAdjustedBounds=" + mAdjustedBounds.toShortString());
-        }
         for (int taskNdx = mChildren.size() - 1; taskNdx >= 0; taskNdx--) {
             mChildren.get(taskNdx).dump(pw, prefix + "  ", dumpAll);
         }
@@ -4391,39 +3740,6 @@
     }
 
     /**
-     * For docked workspace (or workspace that's side-by-side to the docked), provides
-     * information which side of the screen was the dock anchored.
-     */
-    int getDockSide() {
-        return getDockSide(mDisplayContent.getConfiguration(), getRawBounds());
-    }
-
-    int getDockSideForDisplay(DisplayContent dc) {
-        return getDockSide(dc, dc.getConfiguration(), getRawBounds());
-    }
-
-    int getDockSide(Configuration parentConfig, Rect bounds) {
-        if (mDisplayContent == null) {
-            return DOCKED_INVALID;
-        }
-        return getDockSide(mDisplayContent, parentConfig, bounds);
-    }
-
-    private int getDockSide(DisplayContent dc, Configuration parentConfig, Rect bounds) {
-        return dc.getDockedDividerController().getDockSide(bounds,
-                parentConfig.windowConfiguration.getBounds(),
-                parentConfig.orientation, parentConfig.windowConfiguration.getRotation());
-    }
-
-    boolean hasTaskForUser(int userId) {
-        final PooledPredicate p = PooledLambda.obtainPredicate(
-                Task::isTaskForUser, PooledLambda.__(Task.class), userId);
-        final Task task = getTask(p);
-        p.recycle();
-        return task != null;
-    }
-
-    /**
      * Sets the current picture-in-picture aspect ratio.
      */
     void setPictureInPictureAspectRatio(float aspectRatio) {
@@ -4639,16 +3955,11 @@
             bounds.dumpDebug(proto, BOUNDS);
         }
         getOverrideDisplayedBounds().dumpDebug(proto, DISPLAYED_BOUNDS);
-        mAdjustedBounds.dumpDebug(proto, ADJUSTED_BOUNDS);
         if (mLastNonFullscreenBounds != null) {
             mLastNonFullscreenBounds.dumpDebug(proto, LAST_NON_FULLSCREEN_BOUNDS);
         }
 
         proto.write(DEFER_REMOVAL, mDeferRemoval);
-        proto.write(MINIMIZE_AMOUNT, mMinimizeAmount);
-        proto.write(ADJUSTED_FOR_IME, mAdjustedForIme);
-        proto.write(ADJUST_IME_AMOUNT, mAdjustImeAmount);
-        proto.write(ADJUST_DIVIDER_AMOUNT, mAdjustDividerAmount);
         proto.write(ANIMATING_BOUNDS, mBoundsAnimating);
 
         if (mSurfaceControl != null) {
diff --git a/services/core/java/com/android/server/wm/ActivityStackSupervisor.java b/services/core/java/com/android/server/wm/ActivityStackSupervisor.java
index b2d2f62..6d7f8fb 100644
--- a/services/core/java/com/android/server/wm/ActivityStackSupervisor.java
+++ b/services/core/java/com/android/server/wm/ActivityStackSupervisor.java
@@ -35,12 +35,10 @@
 import static android.app.WindowConfiguration.WINDOWING_MODE_FULLSCREEN;
 import static android.app.WindowConfiguration.WINDOWING_MODE_PINNED;
 import static android.app.WindowConfiguration.WINDOWING_MODE_SPLIT_SCREEN_PRIMARY;
-import static android.app.WindowConfiguration.WINDOWING_MODE_SPLIT_SCREEN_SECONDARY;
 import static android.app.WindowConfiguration.WINDOWING_MODE_UNDEFINED;
 import static android.content.pm.PackageManager.NOTIFY_PACKAGE_USE_ACTIVITY;
 import static android.content.pm.PackageManager.PERMISSION_DENIED;
 import static android.content.pm.PackageManager.PERMISSION_GRANTED;
-import static android.graphics.Rect.copyOrNull;
 import static android.os.PowerManager.PARTIAL_WAKE_LOCK;
 import static android.os.Process.INVALID_UID;
 import static android.os.Process.SYSTEM_UID;
@@ -210,17 +208,6 @@
     /** True if the docked stack is currently being resized. */
     private boolean mDockedStackResizing;
 
-    /**
-     * True if there are pending docked bounds that need to be applied after
-     * {@link #mDockedStackResizing} is reset to false.
-     */
-    private boolean mHasPendingDockedBounds;
-    private Rect mPendingDockedBounds;
-    private Rect mPendingTempDockedTaskBounds;
-    private Rect mPendingTempDockedTaskInsetBounds;
-    private Rect mPendingTempOtherTaskBounds;
-    private Rect mPendingTempOtherTaskInsetBounds;
-
     // Activity actions an app cannot start if it uses a permission which is not granted.
     private static final ArrayMap<String, String> ACTION_TO_RUNTIME_PERMISSION =
             new ArrayMap<>();
@@ -387,15 +374,6 @@
      */
     private final ArraySet<Integer> mResizingTasksDuringAnimation = new ArraySet<>();
 
-
-    /**
-     * If set to {@code false} all calls to resize the docked stack {@link #resizeDockedStackLocked}
-     * will be ignored. Useful for the case where the caller is handling resizing of other stack and
-     * moving tasks around and doesn't want dock stack to be resized due to an automatic trigger
-     * like the docked stack going empty.
-     */
-    private boolean mAllowDockedStackResize = true;
-
     private KeyguardController mKeyguardController;
 
     private PowerManager mPowerManager;
@@ -1541,12 +1519,6 @@
                     }
                     otherStack.setWindowingMode(WINDOWING_MODE_UNDEFINED);
                 }
-
-                // Also disable docked stack resizing since we have manually adjusted the
-                // size of other stacks above and we don't want to trigger a docked stack
-                // resize when we remove task from it below and it is detached from the
-                // display because it no longer contains any tasks.
-                mAllowDockedStackResize = false;
             }
 
             // If we are moving from the pinned stack, then the animation takes care of updating
@@ -1563,7 +1535,6 @@
             mRootWindowContainer.ensureActivitiesVisible(null, 0, PRESERVE_WINDOWS);
             mRootWindowContainer.resumeFocusedStacksTopActivities();
         } finally {
-            mAllowDockedStackResize = true;
             mService.continueWindowLayout();
         }
     }
@@ -1580,120 +1551,6 @@
 
         mDockedStackResizing = resizing;
         mWindowManager.setDockedStackResizing(resizing);
-
-        if (!resizing && mHasPendingDockedBounds) {
-            resizeDockedStackLocked(mPendingDockedBounds, mPendingTempDockedTaskBounds,
-                    mPendingTempDockedTaskInsetBounds, mPendingTempOtherTaskBounds,
-                    mPendingTempOtherTaskInsetBounds, PRESERVE_WINDOWS);
-
-            mHasPendingDockedBounds = false;
-            mPendingDockedBounds = null;
-            mPendingTempDockedTaskBounds = null;
-            mPendingTempDockedTaskInsetBounds = null;
-            mPendingTempOtherTaskBounds = null;
-            mPendingTempOtherTaskInsetBounds = null;
-        }
-    }
-
-    void resizeDockedStackLocked(Rect dockedBounds, Rect tempDockedTaskBounds,
-            Rect tempDockedTaskInsetBounds, Rect tempOtherTaskBounds, Rect tempOtherTaskInsetBounds,
-            boolean preserveWindows) {
-        resizeDockedStackLocked(dockedBounds, tempDockedTaskBounds, tempDockedTaskInsetBounds,
-                tempOtherTaskBounds, tempOtherTaskInsetBounds, preserveWindows,
-                false /* deferResume */);
-    }
-
-    void resizeDockedStackLocked(Rect displayedBounds, Rect tempDockedTaskBounds,
-            Rect tempDockedTaskInsetBounds, Rect tempOtherTaskBounds, Rect tempOtherTaskInsetBounds,
-            boolean preserveWindows, boolean deferResume) {
-
-        if (!mAllowDockedStackResize) {
-            // Docked stack resize currently disabled.
-            return;
-        }
-
-        final ActivityStack stack =
-                mRootWindowContainer.getDefaultDisplay().getRootSplitScreenPrimaryTask();
-        if (stack == null) {
-            Slog.w(TAG, "resizeDockedStackLocked: docked stack not found");
-            return;
-        }
-
-        if (mDockedStackResizing) {
-            mHasPendingDockedBounds = true;
-            mPendingDockedBounds = copyOrNull(displayedBounds);
-            mPendingTempDockedTaskBounds = copyOrNull(tempDockedTaskBounds);
-            mPendingTempDockedTaskInsetBounds = copyOrNull(tempDockedTaskInsetBounds);
-            mPendingTempOtherTaskBounds = copyOrNull(tempOtherTaskBounds);
-            mPendingTempOtherTaskInsetBounds = copyOrNull(tempOtherTaskInsetBounds);
-        }
-
-        Trace.traceBegin(TRACE_TAG_WINDOW_MANAGER, "resizeDockedStack");
-        mService.deferWindowLayout();
-        try {
-            // Don't allow re-entry while resizing. E.g. due to docked stack detaching.
-            mAllowDockedStackResize = false;
-            ActivityRecord r = stack.topRunningActivity();
-            stack.resize(displayedBounds, tempDockedTaskBounds,
-                    !PRESERVE_WINDOWS, DEFER_RESUME);
-
-            // TODO: Checking for isAttached might not be needed as if the user passes in null
-            // dockedBounds then they want the docked stack to be dismissed.
-            if (stack.getWindowingMode() == WINDOWING_MODE_FULLSCREEN
-                    || (displayedBounds == null && !stack.isAttached())) {
-                // The dock stack either was dismissed or went fullscreen, which is kinda the same.
-                // In this case we make all other static stacks fullscreen and move all
-                // docked stack tasks to the fullscreen stack.
-                moveTasksToFullscreenStackLocked(stack, ON_TOP);
-
-                // stack shouldn't contain anymore activities, so nothing to resume.
-                r = null;
-            } else {
-                // Docked stacks occupy a dedicated region on screen so the size of all other
-                // static stacks need to be adjusted so they don't overlap with the docked stack.
-                // We get the bounds to use from window manager which has been adjusted for any
-                // screen controls and is also the same for all stacks.
-                final DisplayContent display = mRootWindowContainer.getDefaultDisplay();
-                final Rect otherTaskRect = new Rect();
-                for (int i = display.getStackCount() - 1; i >= 0; --i) {
-                    final ActivityStack current = display.getStackAt(i);
-                    if (!current.inSplitScreenSecondaryWindowingMode()) {
-                        continue;
-                    }
-                    if (!current.affectedBySplitScreenResize()) {
-                        continue;
-                    }
-                    if (mDockedStackResizing && !current.isTopActivityVisible()) {
-                        // Non-visible stacks get resized once we're done with the resize
-                        // interaction.
-                        continue;
-                    }
-                    current.getStackDockedModeBounds(displayedBounds,
-                            tempOtherTaskBounds /* currentTempTaskBounds */,
-                            tempRect /* outStackBounds */,
-                            otherTaskRect /* outTempTaskBounds */);
-
-                    if (tempRect.isEmpty()) {
-                        // If this scenario is hit, it means something is not working right.
-                        // Empty/null bounds implies fullscreen. In the event that this stack
-                        // *should* be fullscreen, its mode should be set explicitly in a form
-                        // of setWindowingMode so that other parts of the system are updated
-                        // properly.
-                        throw new IllegalArgumentException("Trying to set null bounds on a"
-                                + " non-fullscreen stack");
-                    }
-
-                    current.resize(tempRect, tempOtherTaskBounds, preserveWindows, deferResume);
-                }
-            }
-            if (!deferResume) {
-                stack.ensureVisibleActivitiesConfiguration(r, preserveWindows);
-            }
-        } finally {
-            mAllowDockedStackResize = true;
-            mService.continueWindowLayout();
-            Trace.traceEnd(TRACE_TAG_WINDOW_MANAGER);
-        }
     }
 
     private void removeStackInSurfaceTransaction(ActivityStack stack) {
@@ -2723,9 +2580,6 @@
         mService.deferWindowLayout();
         try {
             if (windowingMode == WINDOWING_MODE_SPLIT_SCREEN_PRIMARY) {
-                mWindowManager.setDockedStackCreateStateLocked(
-                        activityOptions.getSplitScreenCreateMode(), null /* initialBounds */);
-
                 // Defer updating the stack in which recents is until the app transition is done, to
                 // not run into issues where we still need to draw the task in recents but the
                 // docked stack is already created.
@@ -2801,24 +2655,6 @@
                 // the window renders full-screen with the background filling the void. Also only
                 // call this at the end to make sure that tasks exists on the window manager side.
                 setResizingDuringAnimation(task);
-
-                final DisplayContent display = task.getStack().getDisplay();
-                final ActivityStack topSecondaryStack =
-                        display.getTopStackInWindowingMode(WINDOWING_MODE_SPLIT_SCREEN_SECONDARY);
-                if (topSecondaryStack != null && topSecondaryStack.isActivityTypeHome()) {
-                    // If the home activity is the top split-screen secondary stack, then the
-                    // primary split-screen stack is in the minimized mode which means it can't
-                    // receive input keys, so we should move the focused app to the home app so that
-                    // window manager can correctly calculate the focus window that can receive
-                    // input keys.
-                    display.moveHomeActivityToTop(
-                            "startActivityFromRecents: homeVisibleInSplitScreen");
-
-                    // Immediately update the minimized docked stack mode, the upcoming animation
-                    // for the docked activity (WMS.overridePendingAppTransitionMultiThumbFuture)
-                    // will do the animation to the target bounds
-                    mWindowManager.checkSplitScreenMinimizedChanged(false /* animate */);
-                }
             }
             mService.continueWindowLayout();
         }
diff --git a/services/core/java/com/android/server/wm/ActivityTaskManagerService.java b/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
index 693a5e4..eaffd2b 100644
--- a/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
+++ b/services/core/java/com/android/server/wm/ActivityTaskManagerService.java
@@ -31,12 +31,12 @@
 import static android.app.ActivityManagerInternal.ALLOW_NON_FULL;
 import static android.app.ActivityTaskManager.INVALID_TASK_ID;
 import static android.app.ActivityTaskManager.RESIZE_MODE_PRESERVE_WINDOW;
-import static android.app.ActivityTaskManager.SPLIT_SCREEN_CREATE_MODE_TOP_OR_LEFT;
 import static android.app.WindowConfiguration.ACTIVITY_TYPE_UNDEFINED;
 import static android.app.WindowConfiguration.WINDOWING_MODE_FREEFORM;
 import static android.app.WindowConfiguration.WINDOWING_MODE_FULLSCREEN;
 import static android.app.WindowConfiguration.WINDOWING_MODE_PINNED;
 import static android.app.WindowConfiguration.WINDOWING_MODE_SPLIT_SCREEN_PRIMARY;
+import static android.app.WindowConfiguration.WINDOWING_MODE_SPLIT_SCREEN_SECONDARY;
 import static android.app.WindowConfiguration.WINDOWING_MODE_UNDEFINED;
 import static android.content.Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS;
 import static android.content.Intent.FLAG_ACTIVITY_NEW_TASK;
@@ -2309,9 +2309,7 @@
     @Override
     public boolean setTaskWindowingMode(int taskId, int windowingMode, boolean toTop) {
         if (windowingMode == WINDOWING_MODE_SPLIT_SCREEN_PRIMARY) {
-            return setTaskWindowingModeSplitScreenPrimary(taskId,
-                    SPLIT_SCREEN_CREATE_MODE_TOP_OR_LEFT,
-                    toTop, ANIMATE, null /* initialBounds */, true /* showRecents */);
+            return setTaskWindowingModeSplitScreenPrimary(taskId, toTop);
         }
         enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS, "setTaskWindowingMode()");
         synchronized (mGlobalLock) {
@@ -2681,10 +2679,6 @@
                     throw new IllegalArgumentException("moveTaskToStack: Attempt to move task "
                             + taskId + " to stack " + stackId);
                 }
-                if (stack.inSplitScreenPrimaryWindowingMode()) {
-                    mWindowManager.setDockedStackCreateStateLocked(
-                            SPLIT_SCREEN_CREATE_MODE_TOP_OR_LEFT, null /* initialBounds */);
-                }
                 task.reparent(stack, toTop, REPARENT_KEEP_STACK_AT_FRONT, ANIMATE, !DEFER_RESUME,
                         "moveTaskToStack");
             } finally {
@@ -2697,22 +2691,11 @@
      * Moves the specified task to the primary-split-screen stack.
      *
      * @param taskId Id of task to move.
-     * @param createMode The mode the primary split screen stack should be created in if it doesn't
-     *                   exist already. See
-     *                   {@link android.app.ActivityTaskManager#SPLIT_SCREEN_CREATE_MODE_TOP_OR_LEFT}
-     *                   and
-     *                   {@link android.app.ActivityTaskManager#SPLIT_SCREEN_CREATE_MODE_BOTTOM_OR_RIGHT}
      * @param toTop If the task and stack should be moved to the top.
-     * @param animate Whether we should play an animation for the moving the task.
-     * @param initialBounds If the primary stack gets created, it will use these bounds for the
-     *                      stack. Pass {@code null} to use default bounds.
-     * @param showRecents If the recents activity should be shown on the other side of the task
-     *                    going into split-screen mode.
      * @return Whether the task was successfully put into splitscreen.
      */
     @Override
-    public boolean setTaskWindowingModeSplitScreenPrimary(int taskId, int createMode,
-            boolean toTop, boolean animate, Rect initialBounds, boolean showRecents) {
+    public boolean setTaskWindowingModeSplitScreenPrimary(int taskId, boolean toTop) {
         enforceCallerIsRecentsOrHasPermission(MANAGE_ACTIVITY_STACKS,
                 "setTaskWindowingModeSplitScreenPrimary()");
         synchronized (mGlobalLock) {
@@ -4273,6 +4256,7 @@
         }
     }
 
+    // TODO(b/149338177): remove when CTS no-longer requires it
     @Override
     public void resizeDockedStack(Rect dockedBounds, Rect tempDockedTaskBounds,
             Rect tempDockedTaskInsetBounds,
@@ -4281,9 +4265,42 @@
         long ident = Binder.clearCallingIdentity();
         try {
             synchronized (mGlobalLock) {
-                mStackSupervisor.resizeDockedStackLocked(dockedBounds, tempDockedTaskBounds,
-                        tempDockedTaskInsetBounds, tempOtherTaskBounds, tempOtherTaskInsetBounds,
-                        PRESERVE_WINDOWS);
+                final DisplayContent dc = mRootWindowContainer.getDefaultDisplay();
+                TaskTile primary = null;
+                TaskTile secondary = null;
+                for (int i = dc.getStackCount() - 1; i >= 0; --i) {
+                    final TaskTile t = dc.getStackAt(i).asTile();
+                    if (t == null) {
+                        continue;
+                    }
+                    if (t.getWindowingMode() == WINDOWING_MODE_SPLIT_SCREEN_PRIMARY) {
+                        primary = t;
+                    } else if (t.getWindowingMode() == WINDOWING_MODE_SPLIT_SCREEN_SECONDARY) {
+                        secondary = t;
+                    }
+                }
+                if (primary == null || secondary == null) {
+                    return;
+                }
+                final WindowContainerTransaction wct = new WindowContainerTransaction();
+                final Rect primaryRect =
+                        tempDockedTaskInsetBounds != null ? tempDockedTaskInsetBounds
+                            : (tempDockedTaskBounds != null ? tempDockedTaskBounds
+                                    : dockedBounds);
+                wct.setBounds(primary.mRemoteToken, primaryRect);
+                Rect otherRect = tempOtherTaskInsetBounds != null ? tempOtherTaskInsetBounds
+                        : tempOtherTaskBounds;
+                if (otherRect == null) {
+                    // Temporary estimation... again this is just for tests.
+                    otherRect = new Rect(secondary.getBounds());
+                    if (dc.getBounds().width() > dc.getBounds().height()) {
+                        otherRect.left = primaryRect.right + 6;
+                    } else {
+                        otherRect.top = primaryRect.bottom + 6;
+                    }
+                }
+                wct.setBounds(secondary.mRemoteToken, otherRect);
+                mTaskOrganizerController.applyContainerTransaction(wct, null /* organizer */);
             }
         } finally {
             Binder.restoreCallingIdentity(ident);
diff --git a/services/core/java/com/android/server/wm/AppTransition.java b/services/core/java/com/android/server/wm/AppTransition.java
index 8cf0881..4ba2943 100644
--- a/services/core/java/com/android/server/wm/AppTransition.java
+++ b/services/core/java/com/android/server/wm/AppTransition.java
@@ -446,8 +446,6 @@
                         ? topOpeningAnim.getStatusBarTransitionsStartTime()
                         : SystemClock.uptimeMillis(),
                 AnimationAdapter.STATUS_BAR_TRANSITION_DURATION);
-        mDisplayContent.getDockedDividerController()
-                .notifyAppTransitionStarting(openingApps, transit);
 
         if (mRemoteAnimationController != null) {
             mRemoteAnimationController.goodToGo();
diff --git a/services/core/java/com/android/server/wm/DisplayContent.java b/services/core/java/com/android/server/wm/DisplayContent.java
index e468810..054e94b 100644
--- a/services/core/java/com/android/server/wm/DisplayContent.java
+++ b/services/core/java/com/android/server/wm/DisplayContent.java
@@ -95,7 +95,6 @@
 import static com.android.server.wm.DisplayContentProto.CLOSING_APPS;
 import static com.android.server.wm.DisplayContentProto.DISPLAY_FRAMES;
 import static com.android.server.wm.DisplayContentProto.DISPLAY_INFO;
-import static com.android.server.wm.DisplayContentProto.DOCKED_STACK_DIVIDER_CONTROLLER;
 import static com.android.server.wm.DisplayContentProto.DPI;
 import static com.android.server.wm.DisplayContentProto.FOCUSED_APP;
 import static com.android.server.wm.DisplayContentProto.FOCUSED_ROOT_TASK_ID;
@@ -132,7 +131,7 @@
 import static com.android.server.wm.WindowManagerService.H.REPORT_FOCUS_CHANGE;
 import static com.android.server.wm.WindowManagerService.H.REPORT_HARD_KEYBOARD_STATUS_CHANGE;
 import static com.android.server.wm.WindowManagerService.H.REPORT_LOSING_FOCUS;
-import static com.android.server.wm.WindowManagerService.H.UPDATE_DOCKED_STACK_DIVIDER;
+import static com.android.server.wm.WindowManagerService.H.UPDATE_MULTI_WINDOW_STACKS;
 import static com.android.server.wm.WindowManagerService.H.WINDOW_HIDE_TIMEOUT;
 import static com.android.server.wm.WindowManagerService.LAYOUT_REPEAT_THRESHOLD;
 import static com.android.server.wm.WindowManagerService.SEAMLESS_ROTATION_TIMEOUT_DURATION;
@@ -1006,7 +1005,7 @@
             mDisplayPolicy.systemReady();
         }
         mWindowCornerRadius = mDisplayPolicy.getWindowCornerRadius();
-        mDividerControllerLocked = new DockedStackDividerController(mWmService, this);
+        mDividerControllerLocked = new DockedStackDividerController(this);
         mPinnedStackControllerLocked = new PinnedStackController(mWmService, this);
 
         final SurfaceControl.Builder b = mWmService.makeSurfaceBuilder(mSession)
@@ -2233,12 +2232,6 @@
      * for bounds calculations.
      */
     void preOnConfigurationChanged() {
-        final DockedStackDividerController dividerController = getDockedDividerController();
-
-        if (dividerController != null) {
-            getDockedDividerController().onConfigurationChanged();
-        }
-
         final PinnedStackController pinnedStackController = getPinnedStackController();
 
         if (pinnedStackController != null) {
@@ -2622,10 +2615,11 @@
         // We also remove the outside touch area for resizing for all freeform
         // tasks (including the focused).
         // We save the focused task region once we find it, and add it back at the end.
-        // If the task is home stack and it is resizable in the minimized state, we want to
-        // exclude the docked stack from touch so we need the entire screen area and not just a
+        // If the task is home stack and it is resizable and visible (top of its root task), we want
+        // to exclude the docked stack from touch so we need the entire screen area and not just a
         // small portion which the home stack currently is resized to.
-        if (task.isActivityTypeHome() && task.getStack().isMinimizedDockAndHomeStackResizable()) {
+        if (task.isActivityTypeHome() && task.isVisible() && task.getStack().getTile() != null
+                && task.isResizeable()) {
             mDisplayContent.getBounds(mTmpRect);
         } else {
             task.getDimBounds(mTmpRect);
@@ -2634,6 +2628,8 @@
         if (task == focusedTask) {
             // Add the focused task rect back into the exclude region once we are done
             // processing stacks.
+            // NOTE: this *looks* like a no-op, but this usage of mTmpRect2 is expected by
+            //       updateTouchExcludeRegion.
             mTmpRect2.set(mTmpRect);
         }
 
@@ -2747,58 +2743,6 @@
         return mDeferredRemoval;
     }
 
-    boolean animateForIme(float interpolatedValue, float animationTarget,
-            float dividerAnimationTarget) {
-        boolean updated = false;
-
-        for (int i = mTaskContainers.getChildCount() - 1; i >= 0; --i) {
-            final ActivityStack stack = mTaskContainers.getChildAt(i);
-            if (stack == null || !stack.isAdjustedForIme()) {
-                continue;
-            }
-
-            if (interpolatedValue >= 1f && animationTarget == 0f && dividerAnimationTarget == 0f) {
-                stack.resetAdjustedForIme(true /* adjustBoundsNow */);
-                updated = true;
-            } else {
-                mDividerControllerLocked.mLastAnimationProgress =
-                        mDividerControllerLocked.getInterpolatedAnimationValue(interpolatedValue);
-                mDividerControllerLocked.mLastDividerProgress =
-                        mDividerControllerLocked.getInterpolatedDividerValue(interpolatedValue);
-                updated |= stack.updateAdjustForIme(
-                        mDividerControllerLocked.mLastAnimationProgress,
-                        mDividerControllerLocked.mLastDividerProgress,
-                        false /* force */);
-            }
-            if (interpolatedValue >= 1f) {
-                stack.endImeAdjustAnimation();
-            }
-        }
-
-        return updated;
-    }
-
-    boolean clearImeAdjustAnimation() {
-        boolean changed = false;
-        for (int i = mTaskContainers.getChildCount() - 1; i >= 0; --i) {
-            final ActivityStack stack = mTaskContainers.getChildAt(i);
-            if (stack != null && stack.isAdjustedForIme()) {
-                stack.resetAdjustedForIme(true /* adjustBoundsNow */);
-                changed  = true;
-            }
-        }
-        return changed;
-    }
-
-    void beginImeAdjustAnimation() {
-        for (int i = mTaskContainers.getChildCount() - 1; i >= 0; --i) {
-            final ActivityStack stack = mTaskContainers.getChildAt(i);
-            if (stack.isVisible() && stack.isAdjustedForIme()) {
-                stack.beginImeAdjustAnimation();
-            }
-        }
-    }
-
     void adjustForImeIfNeeded() {
         final WindowState imeWin = mInputMethodWindow;
         final boolean imeVisible = imeWin != null && imeWin.isVisibleLw()
@@ -2893,7 +2837,6 @@
             final ActivityStack stack = mTaskContainers.getChildAt(i);
             stack.dumpDebug(proto, TASKS, logLevel);
         }
-        mDividerControllerLocked.dumpDebug(proto, DOCKED_STACK_DIVIDER_CONTROLLER);
         for (int i = mOverlayContainers.getChildCount() - 1; i >= 0; --i) {
             final WindowToken windowToken = mOverlayContainers.getChildAt(i);
             windowToken.dumpDebug(proto, OVERLAY_WINDOWS, logLevel);
@@ -3066,8 +3009,6 @@
         }
 
         pw.println();
-        mDividerControllerLocked.dump(prefix, pw);
-        pw.println();
         mPinnedStackControllerLocked.dump(prefix, pw);
 
         pw.println();
@@ -4088,7 +4029,7 @@
             mInputMonitor.updateInputWindowsLw(false /*force*/);
         }
 
-        mWmService.mH.sendEmptyMessage(UPDATE_DOCKED_STACK_DIVIDER);
+        mWmService.mH.sendEmptyMessage(UPDATE_MULTI_WINDOW_STACKS);
     }
 
     /**
@@ -4696,17 +4637,18 @@
         @Override
         int getOrientation(int candidate) {
             if (isStackVisible(WINDOWING_MODE_SPLIT_SCREEN_PRIMARY)) {
-                // Apps and their containers are not allowed to specify an orientation while the
-                // docked stack is visible...except for the home stack if the docked stack is
-                // minimized and it actually set something and the bounds is different from  the
-                // display.
+                // Apps and their containers are not allowed to specify an orientation while using
+                // root tasks...except for the home stack if it is not resizable and currently
+                // visible (top of) its root task.
                 if (mRootHomeTask != null && mRootHomeTask.isVisible()
-                        && mDividerControllerLocked.isMinimizedDock()
-                        && !(mDividerControllerLocked.isHomeStackResizable()
-                        && mRootHomeTask.matchParentBounds())) {
-                    final int orientation = mRootHomeTask.getOrientation();
-                    if (orientation != SCREEN_ORIENTATION_UNSET) {
-                        return orientation;
+                        && mRootHomeTask.getTile() != null) {
+                    final Task topMost = mRootHomeTask.getTopMostTask();
+                    final boolean resizable = topMost == null && topMost.isResizeable();
+                    if (!(resizable && mRootHomeTask.matchParentBounds())) {
+                        final int orientation = mRootHomeTask.getOrientation();
+                        if (orientation != SCREEN_ORIENTATION_UNSET) {
+                            return orientation;
+                        }
                     }
                 }
                 return SCREEN_ORIENTATION_UNSPECIFIED;
@@ -6171,8 +6113,6 @@
                     t.removeAllChildren();
                 }
             }
-            mDividerControllerLocked.setMinimizedDockedStack(false /* minimized */,
-                    false /* animate */);
         } finally {
             final ActivityStack topFullscreenStack =
                     getTopStackInWindowingMode(WINDOWING_MODE_FULLSCREEN);
diff --git a/services/core/java/com/android/server/wm/DisplayPolicy.java b/services/core/java/com/android/server/wm/DisplayPolicy.java
index f02a9dd..497c473 100644
--- a/services/core/java/com/android/server/wm/DisplayPolicy.java
+++ b/services/core/java/com/android/server/wm/DisplayPolicy.java
@@ -1178,8 +1178,6 @@
                     return R.anim.dock_left_enter;
                 }
             }
-        } else if (win.getAttrs().type == TYPE_DOCK_DIVIDER) {
-            return selectDockedDividerAnimation(win, transit);
         }
 
         if (transit == TRANSIT_PREVIEW_DONE) {
@@ -1204,36 +1202,6 @@
         return ANIMATION_STYLEABLE;
     }
 
-    private int selectDockedDividerAnimation(WindowState win, int transit) {
-        int insets = mDisplayContent.getDockedDividerController().getContentInsets();
-
-        // If the divider is behind the navigation bar, don't animate.
-        final Rect frame = win.getFrameLw();
-        final boolean behindNavBar = mNavigationBar != null
-                && ((mNavigationBarPosition == NAV_BAR_BOTTOM
-                && frame.top + insets >= mNavigationBar.getFrameLw().top)
-                || (mNavigationBarPosition == NAV_BAR_RIGHT
-                && frame.left + insets >= mNavigationBar.getFrameLw().left)
-                || (mNavigationBarPosition == NAV_BAR_LEFT
-                && frame.right - insets <= mNavigationBar.getFrameLw().right));
-        final boolean landscape = frame.height() > frame.width();
-        final boolean offscreenLandscape = landscape && (frame.right - insets <= 0
-                || frame.left + insets >= win.getDisplayFrameLw().right);
-        final boolean offscreenPortrait = !landscape && (frame.top - insets <= 0
-                || frame.bottom + insets >= win.getDisplayFrameLw().bottom);
-        final boolean offscreen = offscreenLandscape || offscreenPortrait;
-        if (behindNavBar || offscreen) {
-            return ANIMATION_STYLEABLE;
-        }
-        if (transit == TRANSIT_ENTER || transit == TRANSIT_SHOW) {
-            return R.anim.fade_in;
-        } else if (transit == TRANSIT_EXIT) {
-            return R.anim.fade_out;
-        } else {
-            return ANIMATION_STYLEABLE;
-        }
-    }
-
     /**
      * Called when a new system UI visibility is being reported, allowing
      * the policy to adjust what is actually reported.
diff --git a/services/core/java/com/android/server/wm/DockedStackDividerController.java b/services/core/java/com/android/server/wm/DockedStackDividerController.java
index 958c8ae..20738ed 100644
--- a/services/core/java/com/android/server/wm/DockedStackDividerController.java
+++ b/services/core/java/com/android/server/wm/DockedStackDividerController.java
@@ -16,330 +16,26 @@
 
 package com.android.server.wm;
 
-import static android.app.WindowConfiguration.WINDOWING_MODE_SPLIT_SCREEN_SECONDARY;
-import static android.app.WindowConfiguration.WINDOWING_MODE_UNDEFINED;
-import static android.content.res.Configuration.ORIENTATION_LANDSCAPE;
-import static android.content.res.Configuration.ORIENTATION_PORTRAIT;
-import static android.view.Surface.ROTATION_270;
-import static android.view.Surface.ROTATION_90;
-import static android.view.WindowManager.DOCKED_BOTTOM;
-import static android.view.WindowManager.DOCKED_INVALID;
-import static android.view.WindowManager.DOCKED_LEFT;
-import static android.view.WindowManager.DOCKED_RIGHT;
-import static android.view.WindowManager.DOCKED_TOP;
-import static android.view.WindowManager.TRANSIT_NONE;
-import static android.view.WindowManagerPolicyConstants.NAV_BAR_LEFT;
-import static android.view.WindowManagerPolicyConstants.NAV_BAR_RIGHT;
-
-import static com.android.server.wm.AppTransition.DEFAULT_APP_TRANSITION_DURATION;
-import static com.android.server.wm.AppTransition.TOUCH_RESPONSE_INTERPOLATOR;
-import static com.android.server.wm.DockedStackDividerControllerProto.MINIMIZED_DOCK;
-import static com.android.server.wm.WindowManagerDebugConfig.TAG_WITH_CLASS_NAME;
-import static com.android.server.wm.WindowManagerDebugConfig.TAG_WM;
-
-import android.content.Context;
-import android.content.res.Configuration;
 import android.graphics.Rect;
-import android.os.RemoteCallbackList;
-import android.os.RemoteException;
-import android.util.ArraySet;
-import android.util.Slog;
-import android.util.proto.ProtoOutputStream;
-import android.view.DisplayCutout;
-import android.view.DisplayInfo;
-import android.view.IDockedStackListener;
-import android.view.animation.AnimationUtils;
-import android.view.animation.Interpolator;
-import android.view.animation.PathInterpolator;
-
-import com.android.internal.annotations.VisibleForTesting;
-import com.android.internal.inputmethod.SoftInputShowHideReason;
-import com.android.internal.policy.DividerSnapAlgorithm;
-import com.android.internal.policy.DockedDividerUtils;
-import com.android.server.LocalServices;
-import com.android.server.inputmethod.InputMethodManagerInternal;
-import com.android.server.wm.WindowManagerService.H;
-
-import java.io.PrintWriter;
 
 /**
  * Keeps information about the docked stack divider.
  */
 public class DockedStackDividerController {
 
-    private static final String TAG = TAG_WITH_CLASS_NAME ? "DockedStackDividerController" : TAG_WM;
-
-    /**
-     * The fraction during the maximize/clip reveal animation the divider meets the edge of the clip
-     * revealing surface at the earliest.
-     */
-    private static final float CLIP_REVEAL_MEET_EARLIEST = 0.6f;
-
-    /**
-     * The fraction during the maximize/clip reveal animation the divider meets the edge of the clip
-     * revealing surface at the latest.
-     */
-    private static final float CLIP_REVEAL_MEET_LAST = 1f;
-
-    /**
-     * If the app translates at least CLIP_REVEAL_MEET_FRACTION_MIN * minimize distance, we start
-     * meet somewhere between {@link #CLIP_REVEAL_MEET_LAST} and {@link #CLIP_REVEAL_MEET_EARLIEST}.
-     */
-    private static final float CLIP_REVEAL_MEET_FRACTION_MIN = 0.4f;
-
-    /**
-     * If the app translates equals or more than CLIP_REVEAL_MEET_FRACTION_MIN * minimize distance,
-     * we meet at {@link #CLIP_REVEAL_MEET_EARLIEST}.
-     */
-    private static final float CLIP_REVEAL_MEET_FRACTION_MAX = 0.8f;
-
-    private static final Interpolator IME_ADJUST_ENTRY_INTERPOLATOR =
-            new PathInterpolator(0.2f, 0f, 0.1f, 1f);
-
-    private static final long IME_ADJUST_ANIM_DURATION = 280;
-
-    private static final long IME_ADJUST_DRAWN_TIMEOUT = 200;
-
-    private static final int DIVIDER_WIDTH_INACTIVE_DP = 4;
-
-    private final WindowManagerService mService;
     private final DisplayContent mDisplayContent;
-    private int mDividerWindowWidth;
-    private int mDividerWindowWidthInactive;
-    private int mDividerInsets;
-    private int mTaskHeightInMinimizedMode;
     private boolean mResizing;
-    private WindowState mWindow;
-    private final Rect mTmpRect = new Rect();
-    private final Rect mTmpRect2 = new Rect();
-    private final Rect mTmpRect3 = new Rect();
-    private final Rect mLastRect = new Rect();
-    private boolean mLastVisibility = false;
-    private final RemoteCallbackList<IDockedStackListener> mDockedStackListeners
-            = new RemoteCallbackList<>();
 
-    private boolean mMinimizedDock;
-    private int mOriginalDockedSide = DOCKED_INVALID;
-    private boolean mAnimatingForMinimizedDockedStack;
-    private boolean mAnimationStarted;
-    private long mAnimationStartTime;
-    private float mAnimationStart;
-    private float mAnimationTarget;
-    private long mAnimationDuration;
-    private boolean mAnimationStartDelayed;
-    private final Interpolator mMinimizedDockInterpolator;
-    private float mMaximizeMeetFraction;
     private final Rect mTouchRegion = new Rect();
-    private boolean mAnimatingForIme;
-    private boolean mAdjustedForIme;
-    private int mImeHeight;
-    private WindowState mDelayedImeWin;
-    private boolean mAdjustedForDivider;
-    private float mDividerAnimationStart;
-    private float mDividerAnimationTarget;
-    float mLastAnimationProgress;
-    float mLastDividerProgress;
-    private final DividerSnapAlgorithm[] mSnapAlgorithmForRotation = new DividerSnapAlgorithm[4];
-    private boolean mImeHideRequested;
-    private ActivityStack mDimmedStack;
 
-    DockedStackDividerController(WindowManagerService service, DisplayContent displayContent) {
-        mService = service;
+    DockedStackDividerController(DisplayContent displayContent) {
         mDisplayContent = displayContent;
-        final Context context = service.mContext;
-        mMinimizedDockInterpolator = AnimationUtils.loadInterpolator(
-                context, android.R.interpolator.fast_out_slow_in);
-        loadDimens();
-    }
-
-    int getSmallestWidthDpForBounds(Rect bounds) {
-        final DisplayInfo di = mDisplayContent.getDisplayInfo();
-
-        final int baseDisplayWidth = mDisplayContent.mBaseDisplayWidth;
-        final int baseDisplayHeight = mDisplayContent.mBaseDisplayHeight;
-        int minWidth = Integer.MAX_VALUE;
-
-        // Go through all screen orientations and find the orientation in which the task has the
-        // smallest width.
-        for (int rotation = 0; rotation < 4; rotation++) {
-            mTmpRect.set(bounds);
-            mDisplayContent.rotateBounds(di.rotation, rotation, mTmpRect);
-            final boolean rotated = (rotation == ROTATION_90 || rotation == ROTATION_270);
-            mTmpRect2.set(0, 0,
-                    rotated ? baseDisplayHeight : baseDisplayWidth,
-                    rotated ? baseDisplayWidth : baseDisplayHeight);
-            final int orientation = mTmpRect2.width() <= mTmpRect2.height()
-                    ? ORIENTATION_PORTRAIT
-                    : ORIENTATION_LANDSCAPE;
-            final int dockSide = getDockSide(mTmpRect, mTmpRect2, orientation, rotation);
-            final int position = DockedDividerUtils.calculatePositionForBounds(mTmpRect, dockSide,
-                    getContentWidth());
-
-            final DisplayCutout displayCutout = mDisplayContent.calculateDisplayCutoutForRotation(
-                    rotation).getDisplayCutout();
-
-            // Since we only care about feasible states, snap to the closest snap target, like it
-            // would happen when actually rotating the screen.
-            final int snappedPosition = mSnapAlgorithmForRotation[rotation]
-                    .calculateNonDismissingSnapTarget(position).position;
-            DockedDividerUtils.calculateBoundsForPosition(snappedPosition, dockSide, mTmpRect,
-                    mTmpRect2.width(), mTmpRect2.height(), getContentWidth());
-            mDisplayContent.getDisplayPolicy().getStableInsetsLw(rotation, mTmpRect2.width(),
-                    mTmpRect2.height(), displayCutout, mTmpRect3);
-            mService.intersectDisplayInsetBounds(mTmpRect2, mTmpRect3, mTmpRect);
-            minWidth = Math.min(mTmpRect.width(), minWidth);
-        }
-        return (int) (minWidth / mDisplayContent.getDisplayMetrics().density);
-    }
-
-    /**
-     * Get the current docked side. Determined by its location of {@param bounds} within
-     * {@param displayRect} but if both are the same, it will try to dock to each side and determine
-     * if allowed in its respected {@param orientation}.
-     *
-     * @param bounds bounds of the docked task to get which side is docked
-     * @param displayRect bounds of the display that contains the docked task
-     * @param orientation the origination of device
-     * @return current docked side
-     */
-    int getDockSide(Rect bounds, Rect displayRect, int orientation, int rotation) {
-        if (orientation == Configuration.ORIENTATION_PORTRAIT) {
-            // Portrait mode, docked either at the top or the bottom.
-            final int diff = (displayRect.bottom - bounds.bottom) - (bounds.top - displayRect.top);
-            if (diff > 0) {
-                return DOCKED_TOP;
-            } else if (diff < 0) {
-                return DOCKED_BOTTOM;
-            }
-            return canPrimaryStackDockTo(DOCKED_TOP, displayRect, rotation)
-                    ? DOCKED_TOP : DOCKED_BOTTOM;
-        } else if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
-            // Landscape mode, docked either on the left or on the right.
-            final int diff = (displayRect.right - bounds.right) - (bounds.left - displayRect.left);
-            if (diff > 0) {
-                return DOCKED_LEFT;
-            } else if (diff < 0) {
-                return DOCKED_RIGHT;
-            }
-            return canPrimaryStackDockTo(DOCKED_LEFT, displayRect, rotation)
-                    ? DOCKED_LEFT : DOCKED_RIGHT;
-        }
-        return DOCKED_INVALID;
-    }
-
-    void getHomeStackBoundsInDockedMode(Configuration parentConfig, int dockSide, Rect outBounds) {
-        final DisplayCutout displayCutout = mDisplayContent.getDisplayInfo().displayCutout;
-        final int displayWidth = parentConfig.windowConfiguration.getBounds().width();
-        final int displayHeight = parentConfig.windowConfiguration.getBounds().height();
-        mDisplayContent.getDisplayPolicy().getStableInsetsLw(
-                parentConfig.windowConfiguration.getRotation(), displayWidth, displayHeight,
-                displayCutout, mTmpRect);
-        int dividerSize = mDividerWindowWidth - 2 * mDividerInsets;
-        // The offset in the left (landscape)/top (portrait) is calculated with the minimized
-        // offset value with the divider size and any system insets in that direction.
-        if (parentConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
-            outBounds.set(0, mTaskHeightInMinimizedMode + dividerSize + mTmpRect.top,
-                    displayWidth, displayHeight);
-        } else {
-            // In landscape also inset the left/right side with the status bar height to match the
-            // minimized size height in portrait mode.
-            final int primaryTaskWidth = mTaskHeightInMinimizedMode + dividerSize + mTmpRect.top;
-            int left = mTmpRect.left;
-            int right = displayWidth - mTmpRect.right;
-            if (dockSide == DOCKED_LEFT) {
-                left += primaryTaskWidth;
-            } else if (dockSide == DOCKED_RIGHT) {
-                right -= primaryTaskWidth;
-            }
-            outBounds.set(left, 0, right, displayHeight);
-        }
-    }
-
-    boolean isHomeStackResizable() {
-        final ActivityStack homeStack = mDisplayContent.getRootHomeTask();
-        if (homeStack == null) {
-            return false;
-        }
-        final Task homeTask = homeStack.getTopMostTask();
-        return homeTask != null && homeTask.isResizeable();
-    }
-
-    private void initSnapAlgorithmForRotations() {
-        final Configuration baseConfig = mDisplayContent.getConfiguration();
-
-        // Initialize the snap algorithms for all 4 screen orientations.
-        final Configuration config = new Configuration();
-        for (int rotation = 0; rotation < 4; rotation++) {
-            final boolean rotated = (rotation == ROTATION_90 || rotation == ROTATION_270);
-            final int dw = rotated
-                    ? mDisplayContent.mBaseDisplayHeight
-                    : mDisplayContent.mBaseDisplayWidth;
-            final int dh = rotated
-                    ? mDisplayContent.mBaseDisplayWidth
-                    : mDisplayContent.mBaseDisplayHeight;
-            final DisplayCutout displayCutout =
-                    mDisplayContent.calculateDisplayCutoutForRotation(rotation).getDisplayCutout();
-            final DisplayPolicy displayPolicy =  mDisplayContent.getDisplayPolicy();
-            displayPolicy.getStableInsetsLw(rotation, dw, dh, displayCutout, mTmpRect);
-            config.unset();
-            config.orientation = (dw <= dh) ? ORIENTATION_PORTRAIT : ORIENTATION_LANDSCAPE;
-
-            final int appWidth = displayPolicy.getNonDecorDisplayWidth(dw, dh, rotation,
-                    baseConfig.uiMode, displayCutout);
-            final int appHeight = displayPolicy.getNonDecorDisplayHeight(dw, dh, rotation,
-                    baseConfig.uiMode, displayCutout);
-            displayPolicy.getNonDecorInsetsLw(rotation, dw, dh, displayCutout, mTmpRect);
-            final int leftInset = mTmpRect.left;
-            final int topInset = mTmpRect.top;
-
-            config.windowConfiguration.setAppBounds(leftInset /*left*/, topInset /*top*/,
-                    leftInset + appWidth /*right*/, topInset + appHeight /*bottom*/);
-
-            final float density = mDisplayContent.getDisplayMetrics().density;
-            config.screenWidthDp = (int) (displayPolicy.getConfigDisplayWidth(dw, dh, rotation,
-                    baseConfig.uiMode, displayCutout) / density);
-            config.screenHeightDp = (int) (displayPolicy.getConfigDisplayHeight(dw, dh, rotation,
-                    baseConfig.uiMode, displayCutout) / density);
-            final Context rotationContext = mService.mContext.createConfigurationContext(config);
-            mSnapAlgorithmForRotation[rotation] = new DividerSnapAlgorithm(
-                    rotationContext.getResources(), dw, dh, getContentWidth(),
-                    config.orientation == ORIENTATION_PORTRAIT, mTmpRect);
-        }
-    }
-
-    private void loadDimens() {
-        final Context context = mService.mContext;
-        mDividerWindowWidth = context.getResources().getDimensionPixelSize(
-                com.android.internal.R.dimen.docked_stack_divider_thickness);
-        mDividerInsets = context.getResources().getDimensionPixelSize(
-                com.android.internal.R.dimen.docked_stack_divider_insets);
-        mDividerWindowWidthInactive = WindowManagerService.dipToPixel(
-                DIVIDER_WIDTH_INACTIVE_DP, mDisplayContent.getDisplayMetrics());
-        mTaskHeightInMinimizedMode = context.getResources().getDimensionPixelSize(
-                com.android.internal.R.dimen.task_height_of_minimized_mode);
-        initSnapAlgorithmForRotations();
-    }
-
-    void onConfigurationChanged() {
-        loadDimens();
     }
 
     boolean isResizing() {
         return mResizing;
     }
 
-    int getContentWidth() {
-        return mDividerWindowWidth - 2 * mDividerInsets;
-    }
-
-    int getContentInsets() {
-        return mDividerInsets;
-    }
-
-    int getContentWidthInactive() {
-        return mDividerWindowWidthInactive;
-    }
-
     void setResizing(boolean resizing) {
         if (mResizing != resizing) {
             mResizing = resizing;
@@ -353,676 +49,10 @@
 
     void getTouchRegion(Rect outRegion) {
         outRegion.set(mTouchRegion);
-        if (mWindow != null) {
-            outRegion.offset(mWindow.getFrameLw().left, mWindow.getFrameLw().top);
-        }
     }
 
     private void resetDragResizingChangeReported() {
         mDisplayContent.forAllWindows(WindowState::resetDragResizingChangeReported,
                 true /* traverseTopToBottom */ );
     }
-
-    void setWindow(WindowState window) {
-        mWindow = window;
-        reevaluateVisibility(false);
-    }
-
-    void reevaluateVisibility(boolean force) {
-        if (mWindow == null) {
-            return;
-        }
-        ActivityStack stack = mDisplayContent.getRootSplitScreenPrimaryTask();
-
-        // If the stack is invisible, we policy force hide it in WindowAnimator.shouldForceHide
-        final boolean visible = stack != null;
-        if (mLastVisibility == visible && !force) {
-            return;
-        }
-        mLastVisibility = visible;
-        notifyDockedDividerVisibilityChanged(visible);
-        if (!visible) {
-            setResizeDimLayer(false, WINDOWING_MODE_UNDEFINED, 0f);
-        }
-    }
-
-    private boolean wasVisible() {
-        return mLastVisibility;
-    }
-
-    void setAdjustedForIme(
-            boolean adjustedForIme, boolean adjustedForDivider,
-            boolean animate, WindowState imeWin, int imeHeight) {
-        if (mAdjustedForIme != adjustedForIme || (adjustedForIme && mImeHeight != imeHeight)
-                || mAdjustedForDivider != adjustedForDivider) {
-            if (animate && !mAnimatingForMinimizedDockedStack) {
-                // Notify SystemUI to set the target docked stack size according current docked
-                // state without animation when calling startImeAdjustAnimation.
-                notifyDockedStackMinimizedChanged(mMinimizedDock, false /* animate */,
-                        isHomeStackResizable());
-                startImeAdjustAnimation(adjustedForIme, adjustedForDivider, imeWin);
-            } else {
-                // Animation might be delayed, so only notify if we don't run an animation.
-                notifyAdjustedForImeChanged(adjustedForIme || adjustedForDivider, 0 /* duration */);
-            }
-            mAdjustedForIme = adjustedForIme;
-            mImeHeight = imeHeight;
-            mAdjustedForDivider = adjustedForDivider;
-        }
-    }
-
-    int getImeHeightAdjustedFor() {
-        return mImeHeight;
-    }
-
-    void positionDockedStackedDivider(Rect frame) {
-        ActivityStack stack = mDisplayContent.getRootSplitScreenPrimaryTask();
-        if (stack == null) {
-            // Unfortunately we might end up with still having a divider, even though the underlying
-            // stack was already removed. This is because we are on AM thread and the removal of the
-            // divider was deferred to WM thread and hasn't happened yet. In that case let's just
-            // keep putting it in the same place it was before the stack was removed to have
-            // continuity and prevent it from jumping to the center. It will get hidden soon.
-            frame.set(mLastRect);
-            return;
-        } else {
-            stack.getDimBounds(mTmpRect);
-        }
-        int side = stack.getDockSide();
-        switch (side) {
-            case DOCKED_LEFT:
-                frame.set(mTmpRect.right - mDividerInsets, frame.top,
-                        mTmpRect.right + frame.width() - mDividerInsets, frame.bottom);
-                break;
-            case DOCKED_TOP:
-                frame.set(frame.left, mTmpRect.bottom - mDividerInsets,
-                        mTmpRect.right, mTmpRect.bottom + frame.height() - mDividerInsets);
-                break;
-            case DOCKED_RIGHT:
-                frame.set(mTmpRect.left - frame.width() + mDividerInsets, frame.top,
-                        mTmpRect.left + mDividerInsets, frame.bottom);
-                break;
-            case DOCKED_BOTTOM:
-                frame.set(frame.left, mTmpRect.top - frame.height() + mDividerInsets,
-                        frame.right, mTmpRect.top + mDividerInsets);
-                break;
-        }
-        mLastRect.set(frame);
-    }
-
-    private void notifyDockedDividerVisibilityChanged(boolean visible) {
-        final int size = mDockedStackListeners.beginBroadcast();
-        for (int i = 0; i < size; ++i) {
-            final IDockedStackListener listener = mDockedStackListeners.getBroadcastItem(i);
-            try {
-                listener.onDividerVisibilityChanged(visible);
-            } catch (RemoteException e) {
-                Slog.e(TAG_WM, "Error delivering divider visibility changed event.", e);
-            }
-        }
-        mDockedStackListeners.finishBroadcast();
-    }
-
-    /**
-     * Checks if the primary stack is allowed to dock to a specific side based on its original dock
-     * side.
-     *
-     * @param dockSide the side to see if it is valid
-     * @return true if the side provided is valid
-     */
-    boolean canPrimaryStackDockTo(int dockSide, Rect parentRect, int rotation) {
-        final DisplayPolicy policy = mDisplayContent.getDisplayPolicy();
-        return isDockSideAllowed(dockSide, mOriginalDockedSide,
-                policy.navigationBarPosition(parentRect.width(), parentRect.height(), rotation),
-                policy.navigationBarCanMove());
-    }
-
-    @VisibleForTesting
-    static boolean isDockSideAllowed(int dockSide, int originalDockSide, int navBarPosition,
-            boolean navigationBarCanMove) {
-        if (dockSide == DOCKED_TOP) {
-            return true;
-        }
-
-        if (navigationBarCanMove) {
-            // Only allow the dockside opposite to the nav bar position in landscape
-            return dockSide == DOCKED_LEFT && navBarPosition == NAV_BAR_RIGHT
-                    || dockSide == DOCKED_RIGHT && navBarPosition == NAV_BAR_LEFT;
-        }
-
-        // Side is the same as original side
-        if (dockSide == originalDockSide) {
-            return true;
-        }
-
-        // Only if original docked side was top in portrait will allow left for landscape
-        return dockSide == DOCKED_LEFT && originalDockSide == DOCKED_TOP;
-    }
-
-    void notifyDockedStackExistsChanged(boolean exists) {
-        // TODO(multi-display): Perform all actions only for current display.
-        final int size = mDockedStackListeners.beginBroadcast();
-        for (int i = 0; i < size; ++i) {
-            final IDockedStackListener listener = mDockedStackListeners.getBroadcastItem(i);
-            try {
-                listener.onDockedStackExistsChanged(exists);
-            } catch (RemoteException e) {
-                Slog.e(TAG_WM, "Error delivering docked stack exists changed event.", e);
-            }
-        }
-        mDockedStackListeners.finishBroadcast();
-        if (exists) {
-            InputMethodManagerInternal inputMethodManagerInternal =
-                    LocalServices.getService(InputMethodManagerInternal.class);
-            if (inputMethodManagerInternal != null) {
-
-                // Hide the current IME to avoid problems with animations from IME adjustment when
-                // attaching the docked stack.
-                inputMethodManagerInternal.hideCurrentInputMethod(
-                        SoftInputShowHideReason.HIDE_DOCKED_STACK_ATTACHED);
-                mImeHideRequested = true;
-            }
-
-            // If a primary stack was just created, it will not have access to display content at
-            // this point so pass it from here to get a valid dock side.
-            final ActivityStack stack =
-                    mDisplayContent.getRootSplitScreenPrimaryTask();
-            mOriginalDockedSide = stack.getDockSideForDisplay(mDisplayContent);
-            return;
-        }
-        mOriginalDockedSide = DOCKED_INVALID;
-        setMinimizedDockedStack(false /* minimizedDock */, false /* animate */);
-
-        if (mDimmedStack != null) {
-            mDimmedStack.stopDimming();
-            mDimmedStack = null;
-        }
-    }
-
-    /**
-     * Resets the state that IME hide has been requested. See {@link #isImeHideRequested}.
-     */
-    void resetImeHideRequested() {
-        mImeHideRequested = false;
-    }
-
-    /**
-     * The docked stack divider controller makes sure the IME gets hidden when attaching the docked
-     * stack, to avoid animation problems. This flag indicates whether the request to hide the IME
-     * has been sent in an asynchronous manner, and the IME should be treated as hidden already.
-     *
-     * @return whether IME hide request has been sent
-     */
-    boolean isImeHideRequested() {
-        return mImeHideRequested;
-    }
-
-    private void notifyDockedStackMinimizedChanged(boolean minimizedDock, boolean animate,
-            boolean isHomeStackResizable) {
-        long animDuration = 0;
-        if (animate) {
-            final ActivityStack stack =
-                    mDisplayContent.getRootSplitScreenPrimaryTask();
-            final long transitionDuration = isAnimationMaximizing()
-                    ? mDisplayContent.mAppTransition.getLastClipRevealTransitionDuration()
-                    : DEFAULT_APP_TRANSITION_DURATION;
-            mAnimationDuration = (long)
-                    (transitionDuration * mService.getTransitionAnimationScaleLocked());
-            mMaximizeMeetFraction = getClipRevealMeetFraction(stack);
-            animDuration = (long) (mAnimationDuration * mMaximizeMeetFraction);
-        }
-        final int size = mDockedStackListeners.beginBroadcast();
-        for (int i = 0; i < size; ++i) {
-            final IDockedStackListener listener = mDockedStackListeners.getBroadcastItem(i);
-            try {
-                listener.onDockedStackMinimizedChanged(minimizedDock, animDuration,
-                        isHomeStackResizable);
-            } catch (RemoteException e) {
-                Slog.e(TAG_WM, "Error delivering minimized dock changed event.", e);
-            }
-        }
-        mDockedStackListeners.finishBroadcast();
-        // Only notify ATM after we update the remote listeners, otherwise it may trigger another
-        // minimize change, which would lead to an inversion of states send to the listeners
-        mService.mAtmInternal.notifyDockedStackMinimizedChanged(minimizedDock);
-    }
-
-    void notifyDockSideChanged(int newDockSide) {
-        final int size = mDockedStackListeners.beginBroadcast();
-        for (int i = 0; i < size; ++i) {
-            final IDockedStackListener listener = mDockedStackListeners.getBroadcastItem(i);
-            try {
-                listener.onDockSideChanged(newDockSide);
-            } catch (RemoteException e) {
-                Slog.e(TAG_WM, "Error delivering dock side changed event.", e);
-            }
-        }
-        mDockedStackListeners.finishBroadcast();
-    }
-
-    private void notifyAdjustedForImeChanged(boolean adjustedForIme, long animDuration) {
-        final int size = mDockedStackListeners.beginBroadcast();
-        for (int i = 0; i < size; ++i) {
-            final IDockedStackListener listener = mDockedStackListeners.getBroadcastItem(i);
-            try {
-                listener.onAdjustedForImeChanged(adjustedForIme, animDuration);
-            } catch (RemoteException e) {
-                Slog.e(TAG_WM, "Error delivering adjusted for ime changed event.", e);
-            }
-        }
-        mDockedStackListeners.finishBroadcast();
-    }
-
-    void registerDockedStackListener(IDockedStackListener listener) {
-        mDockedStackListeners.register(listener);
-        notifyDockedDividerVisibilityChanged(wasVisible());
-        notifyDockedStackExistsChanged(
-                mDisplayContent.getRootSplitScreenPrimaryTask() != null);
-        notifyDockedStackMinimizedChanged(mMinimizedDock, false /* animate */,
-                isHomeStackResizable());
-        notifyAdjustedForImeChanged(mAdjustedForIme, 0 /* animDuration */);
-
-    }
-
-    /**
-     * Shows a dim layer with {@param alpha} if {@param visible} is true and
-     * {@param targetWindowingMode} isn't
-     * {@link android.app.WindowConfiguration#WINDOWING_MODE_UNDEFINED} and there is a stack on the
-     * display in that windowing mode.
-     */
-    void setResizeDimLayer(boolean visible, int targetWindowingMode, float alpha) {
-        // TODO: Maybe only allow split-screen windowing modes?
-        final ActivityStack stack = targetWindowingMode != WINDOWING_MODE_UNDEFINED
-                ? mDisplayContent.getTopStackInWindowingMode(targetWindowingMode)
-                : null;
-        final ActivityStack dockedStack = mDisplayContent.getRootSplitScreenPrimaryTask();
-        boolean visibleAndValid = visible && stack != null && dockedStack != null;
-
-        // Ensure an old dim that was shown for the docked stack divider is removed so we don't end
-        // up with dim layers that can no longer be removed.
-        if (mDimmedStack != null && mDimmedStack != stack) {
-            mDimmedStack.stopDimming();
-            mDimmedStack = null;
-        }
-
-        if (visibleAndValid) {
-            mDimmedStack = stack;
-            stack.dim(alpha);
-        }
-        if (!visibleAndValid && stack != null) {
-            mDimmedStack = null;
-            stack.stopDimming();
-        }
-    }
-
-    /**
-     * Notifies the docked stack divider controller of a visibility change that happens without
-     * an animation.
-     */
-    void notifyAppVisibilityChanged() {
-        checkMinimizeChanged(false /* animate */);
-    }
-
-    void notifyAppTransitionStarting(ArraySet<ActivityRecord> openingApps, int appTransition) {
-        final boolean wasMinimized = mMinimizedDock;
-        checkMinimizeChanged(true /* animate */);
-
-        // We were minimized, and now we are still minimized, but somebody is trying to launch an
-        // app in docked stack, better show recent apps so we actually get unminimized! However do
-        // not do this if keyguard is dismissed such as when the device is unlocking. This catches
-        // any case that was missed in ActivityStarter.postStartActivityUncheckedProcessing because
-        // we couldn't retrace the launch of the app in the docked stack to the launch from
-        // homescreen.
-        if (wasMinimized && mMinimizedDock && containsAppInDockedStack(openingApps)
-                && appTransition != TRANSIT_NONE &&
-                !AppTransition.isKeyguardGoingAwayTransit(appTransition)) {
-            if (mService.mAtmInternal.isRecentsComponentHomeActivity(mService.mCurrentUserId)) {
-                // When the home activity is the recents component and we are already minimized,
-                // then there is nothing to do here since home is already visible
-            } else {
-                mService.showRecentApps();
-            }
-        }
-    }
-
-    /**
-     * @return true if {@param apps} contains an activity in the docked stack, false otherwise.
-     */
-    private boolean containsAppInDockedStack(ArraySet<ActivityRecord> apps) {
-        for (int i = apps.size() - 1; i >= 0; i--) {
-            final ActivityRecord activity = apps.valueAt(i);
-            if (activity.getTask() != null && activity.inSplitScreenPrimaryWindowingMode()) {
-                return true;
-            }
-        }
-        return false;
-    }
-
-    boolean isMinimizedDock() {
-        return mMinimizedDock;
-    }
-
-    void checkMinimizeChanged(boolean animate) {
-        if (mDisplayContent.getRootSplitScreenPrimaryTask() == null) {
-            return;
-        }
-        final ActivityStack homeStack = mDisplayContent.getRootHomeTask();
-        if (homeStack == null) {
-            return;
-        }
-        final Task homeTask = homeStack.getTopMostTask();
-        if (homeTask == null || !isWithinDisplay(homeTask)) {
-            return;
-        }
-
-        // Do not minimize when dock is already minimized while keyguard is showing and not
-        // occluded such as unlocking the screen
-        if (mMinimizedDock && mService.mKeyguardOrAodShowingOnDefaultDisplay) {
-            return;
-        }
-        final ActivityStack topSecondaryStack = mDisplayContent.getTopStackInWindowingMode(
-                WINDOWING_MODE_SPLIT_SCREEN_SECONDARY);
-        final RecentsAnimationController recentsAnim = mService.getRecentsAnimationController();
-        final boolean minimizedForRecentsAnimation = recentsAnim != null &&
-                recentsAnim.isSplitScreenMinimized();
-        boolean homeVisible = homeTask.getTopVisibleActivity() != null;
-        if (homeVisible && topSecondaryStack != null) {
-            // Home should only be considered visible if it is greater or equal to the top secondary
-            // stack in terms of z-order.
-            homeVisible = homeStack.compareTo(topSecondaryStack) >= 0;
-        }
-        setMinimizedDockedStack(homeVisible || minimizedForRecentsAnimation, animate);
-    }
-
-    private boolean isWithinDisplay(Task task) {
-        task.getBounds(mTmpRect);
-        mDisplayContent.getBounds(mTmpRect2);
-        return mTmpRect.intersect(mTmpRect2);
-    }
-
-    /**
-     * Sets whether the docked stack is currently in a minimized state, i.e. all the tasks in the
-     * docked stack are heavily clipped so you can only see a minimal peek state.
-     *
-     * @param minimizedDock Whether the docked stack is currently minimized.
-     * @param animate Whether to animate the change.
-     */
-    void setMinimizedDockedStack(boolean minimizedDock, boolean animate) {
-        final boolean wasMinimized = mMinimizedDock;
-        mMinimizedDock = minimizedDock;
-        if (minimizedDock == wasMinimized) {
-            return;
-        }
-
-        final boolean imeChanged = clearImeAdjustAnimation();
-        boolean minimizedChange = false;
-        if (isHomeStackResizable()) {
-            notifyDockedStackMinimizedChanged(minimizedDock, animate,
-                    true /* isHomeStackResizable */);
-            minimizedChange = true;
-        } else {
-            if (minimizedDock) {
-                if (animate) {
-                    startAdjustAnimation(0f, 1f);
-                } else {
-                    minimizedChange |= setMinimizedDockedStack(true);
-                }
-            } else {
-                if (animate) {
-                    startAdjustAnimation(1f, 0f);
-                } else {
-                    minimizedChange |= setMinimizedDockedStack(false);
-                }
-            }
-        }
-        if (imeChanged || minimizedChange) {
-            if (imeChanged && !minimizedChange) {
-                Slog.d(TAG, "setMinimizedDockedStack: IME adjust changed due to minimizing,"
-                        + " minimizedDock=" + minimizedDock
-                        + " minimizedChange=" + minimizedChange);
-            }
-            mService.mWindowPlacerLocked.performSurfacePlacement();
-        }
-    }
-
-    private boolean clearImeAdjustAnimation() {
-        final boolean changed = mDisplayContent.clearImeAdjustAnimation();
-        mAnimatingForIme = false;
-        return changed;
-    }
-
-    private void startAdjustAnimation(float from, float to) {
-        mAnimatingForMinimizedDockedStack = true;
-        mAnimationStarted = false;
-        mAnimationStart = from;
-        mAnimationTarget = to;
-    }
-
-    private void startImeAdjustAnimation(
-            boolean adjustedForIme, boolean adjustedForDivider, WindowState imeWin) {
-
-        // If we're not in an animation, the starting point depends on whether we're adjusted
-        // or not. If we're already in an animation, we start from where the current animation
-        // left off, so that the motion doesn't look discontinuous.
-        if (!mAnimatingForIme) {
-            mAnimationStart = mAdjustedForIme ? 1 : 0;
-            mDividerAnimationStart = mAdjustedForDivider ? 1 : 0;
-            mLastAnimationProgress = mAnimationStart;
-            mLastDividerProgress = mDividerAnimationStart;
-        } else {
-            mAnimationStart = mLastAnimationProgress;
-            mDividerAnimationStart = mLastDividerProgress;
-        }
-        mAnimatingForIme = true;
-        mAnimationStarted = false;
-        mAnimationTarget = adjustedForIme ? 1 : 0;
-        mDividerAnimationTarget = adjustedForDivider ? 1 : 0;
-
-        mDisplayContent.beginImeAdjustAnimation();
-
-        // We put all tasks into drag resizing mode - wait until all of them have completed the
-        // drag resizing switch.
-        final Runnable existingWaitingForDrwanCallback =
-                mService.mWaitingForDrawnCallbacks.get(mService.mRoot);
-        if (existingWaitingForDrwanCallback != null) {
-            mService.mH.removeMessages(H.WAITING_FOR_DRAWN_TIMEOUT, mService.mRoot);
-            mService.mH.sendMessageDelayed(mService.mH.obtainMessage(H.WAITING_FOR_DRAWN_TIMEOUT,
-                    mService.mRoot),
-                    IME_ADJUST_DRAWN_TIMEOUT);
-            mAnimationStartDelayed = true;
-            if (imeWin != null) {
-
-                // There might be an old window delaying the animation start - clear it.
-                if (mDelayedImeWin != null) {
-                    mDelayedImeWin.endDelayingAnimationStart();
-                }
-                mDelayedImeWin = imeWin;
-                imeWin.startDelayingAnimationStart();
-            }
-
-            // If we are already waiting for something to be drawn, clear out the old one so it
-            // still gets executed.
-            // TODO: Have a real system where we can wait on different windows to be drawn with
-            // different callbacks.
-            existingWaitingForDrwanCallback.run();
-            mService.mWaitingForDrawnCallbacks.put(mService.mRoot, () -> {
-                synchronized (mService.mGlobalLock) {
-                    mAnimationStartDelayed = false;
-                    if (mDelayedImeWin != null) {
-                        mDelayedImeWin.endDelayingAnimationStart();
-                    }
-                    // If the adjust status changed since this was posted, only notify
-                    // the new states and don't animate.
-                    long duration = 0;
-                    if (mAdjustedForIme == adjustedForIme
-                            && mAdjustedForDivider == adjustedForDivider) {
-                        duration = IME_ADJUST_ANIM_DURATION;
-                    } else {
-                        Slog.w(TAG, "IME adjust changed while waiting for drawn:"
-                                + " adjustedForIme=" + adjustedForIme
-                                + " adjustedForDivider=" + adjustedForDivider
-                                + " mAdjustedForIme=" + mAdjustedForIme
-                                + " mAdjustedForDivider=" + mAdjustedForDivider);
-                    }
-                    notifyAdjustedForImeChanged(
-                            mAdjustedForIme || mAdjustedForDivider, duration);
-                }
-            });
-        } else {
-            notifyAdjustedForImeChanged(
-                    adjustedForIme || adjustedForDivider, IME_ADJUST_ANIM_DURATION);
-        }
-    }
-
-    private boolean setMinimizedDockedStack(boolean minimized) {
-        final ActivityStack stack = mDisplayContent.getRootSplitScreenPrimaryTask();
-        notifyDockedStackMinimizedChanged(minimized, false /* animate */, isHomeStackResizable());
-        return stack != null && stack.setAdjustedForMinimizedDock(minimized ? 1f : 0f);
-    }
-
-    private boolean isAnimationMaximizing() {
-        return mAnimationTarget == 0f;
-    }
-
-    public boolean animate(long now) {
-        if (mWindow == null) {
-            return false;
-        }
-        if (mAnimatingForMinimizedDockedStack) {
-            return animateForMinimizedDockedStack(now);
-        } else if (mAnimatingForIme && !mDisplayContent.mAppTransition.isRunning()) {
-            // To prevent task stack resize animation may flicking when playing app transition
-            // animation & IME window enter animation in parallel, make sure app transition is done
-            // and then start to animate for IME.
-            return animateForIme(now);
-        }
-        return false;
-    }
-
-    private boolean animateForIme(long now) {
-        if (!mAnimationStarted || mAnimationStartDelayed) {
-            mAnimationStarted = true;
-            mAnimationStartTime = now;
-            mAnimationDuration = (long)
-                    (IME_ADJUST_ANIM_DURATION * mService.getWindowAnimationScaleLocked());
-        }
-        float t = Math.min(1f, (float) (now - mAnimationStartTime) / mAnimationDuration);
-        t = (mAnimationTarget == 1f ? IME_ADJUST_ENTRY_INTERPOLATOR : TOUCH_RESPONSE_INTERPOLATOR)
-                .getInterpolation(t);
-        final boolean updated =
-                mDisplayContent.animateForIme(t, mAnimationTarget, mDividerAnimationTarget);
-        if (updated) {
-            mService.mWindowPlacerLocked.performSurfacePlacement();
-        }
-        if (t >= 1.0f) {
-            mLastAnimationProgress = mAnimationTarget;
-            mLastDividerProgress = mDividerAnimationTarget;
-            mAnimatingForIme = false;
-            return false;
-        } else {
-            return true;
-        }
-    }
-
-    private boolean animateForMinimizedDockedStack(long now) {
-        final ActivityStack stack = mDisplayContent.getRootSplitScreenPrimaryTask();
-        if (!mAnimationStarted) {
-            mAnimationStarted = true;
-            mAnimationStartTime = now;
-            notifyDockedStackMinimizedChanged(mMinimizedDock, true /* animate */,
-                    isHomeStackResizable() /* isHomeStackResizable */);
-        }
-        float t = Math.min(1f, (float) (now - mAnimationStartTime) / mAnimationDuration);
-        t = (isAnimationMaximizing() ? TOUCH_RESPONSE_INTERPOLATOR : mMinimizedDockInterpolator)
-                .getInterpolation(t);
-        if (stack != null) {
-            if (stack.setAdjustedForMinimizedDock(getMinimizeAmount(stack, t))) {
-                mService.mWindowPlacerLocked.performSurfacePlacement();
-            }
-        }
-        if (t >= 1.0f) {
-            mAnimatingForMinimizedDockedStack = false;
-            return false;
-        } else {
-            return true;
-        }
-    }
-
-    float getInterpolatedAnimationValue(float t) {
-        return t * mAnimationTarget + (1 - t) * mAnimationStart;
-    }
-
-    float getInterpolatedDividerValue(float t) {
-        return t * mDividerAnimationTarget + (1 - t) * mDividerAnimationStart;
-    }
-
-    /**
-     * Gets the amount how much to minimize a stack depending on the interpolated fraction t.
-     */
-    private float getMinimizeAmount(ActivityStack stack, float t) {
-        final float naturalAmount = getInterpolatedAnimationValue(t);
-        if (isAnimationMaximizing()) {
-            return adjustMaximizeAmount(stack, t, naturalAmount);
-        } else {
-            return naturalAmount;
-        }
-    }
-
-    /**
-     * When maximizing the stack during a clip reveal transition, this adjusts the minimize amount
-     * during the transition such that the edge of the clip reveal rect is met earlier in the
-     * transition so we don't create a visible "hole", but only if both the clip reveal and the
-     * docked stack divider start from about the same portion on the screen.
-     */
-    private float adjustMaximizeAmount(ActivityStack stack, float t, float naturalAmount) {
-        if (mMaximizeMeetFraction == 1f) {
-            return naturalAmount;
-        }
-        final int minimizeDistance = stack.getMinimizeDistance();
-        final float startPrime = mDisplayContent.mAppTransition.getLastClipRevealMaxTranslation()
-                / (float) minimizeDistance;
-        final float amountPrime = t * mAnimationTarget + (1 - t) * startPrime;
-        final float t2 = Math.min(t / mMaximizeMeetFraction, 1);
-        return amountPrime * t2 + naturalAmount * (1 - t2);
-    }
-
-    /**
-     * Retrieves the animation fraction at which the docked stack has to meet the clip reveal
-     * edge. See {@link #adjustMaximizeAmount}.
-     */
-    private float getClipRevealMeetFraction(ActivityStack stack) {
-        if (!isAnimationMaximizing() || stack == null ||
-                !mDisplayContent.mAppTransition.hadClipRevealAnimation()) {
-            return 1f;
-        }
-        final int minimizeDistance = stack.getMinimizeDistance();
-        final float fraction = Math.abs(mDisplayContent.mAppTransition
-                .getLastClipRevealMaxTranslation()) / (float) minimizeDistance;
-        final float t = Math.max(0, Math.min(1, (fraction - CLIP_REVEAL_MEET_FRACTION_MIN)
-                / (CLIP_REVEAL_MEET_FRACTION_MAX - CLIP_REVEAL_MEET_FRACTION_MIN)));
-        return CLIP_REVEAL_MEET_EARLIEST
-                + (1 - t) * (CLIP_REVEAL_MEET_LAST - CLIP_REVEAL_MEET_EARLIEST);
-    }
-
-    public String toShortString() {
-        return TAG;
-    }
-
-    WindowState getWindow() {
-        return mWindow;
-    }
-
-    void dump(String prefix, PrintWriter pw) {
-        pw.println(prefix + "DockedStackDividerController");
-        pw.println(prefix + "  mLastVisibility=" + mLastVisibility);
-        pw.println(prefix + "  mMinimizedDock=" + mMinimizedDock);
-        pw.println(prefix + "  mAdjustedForIme=" + mAdjustedForIme);
-        pw.println(prefix + "  mAdjustedForDivider=" + mAdjustedForDivider);
-    }
-
-    void dumpDebug(ProtoOutputStream proto, long fieldId) {
-        final long token = proto.start(fieldId);
-        proto.write(MINIMIZED_DOCK, mMinimizedDock);
-        proto.end(token);
-    }
 }
diff --git a/services/core/java/com/android/server/wm/RecentsAnimationController.java b/services/core/java/com/android/server/wm/RecentsAnimationController.java
index e69551a..3e0cff1 100644
--- a/services/core/java/com/android/server/wm/RecentsAnimationController.java
+++ b/services/core/java/com/android/server/wm/RecentsAnimationController.java
@@ -125,10 +125,6 @@
     // enabled for it to start intercepting touch events.
     private boolean mInputConsumerEnabled;
 
-    // Whether or not the recents animation should cause the primary split-screen stack to be
-    // minimized
-    private boolean mSplitScreenMinimized;
-
     private final Rect mTmpRect = new Rect();
 
     private boolean mLinkedToDeathOfRunner;
@@ -277,23 +273,6 @@
         }
 
         @Override
-        public void setSplitScreenMinimized(boolean minimized) {
-            final long token = Binder.clearCallingIdentity();
-            try {
-                synchronized (mService.getWindowManagerLock()) {
-                    if (mCanceled) {
-                        return;
-                    }
-
-                    mSplitScreenMinimized = minimized;
-                    mService.checkSplitScreenMinimizedChanged(true /* animate */);
-                }
-            } finally {
-                Binder.restoreCallingIdentity(token);
-            }
-        }
-
-        @Override
         public void hideCurrentInputMethod() {
             final long token = Binder.clearCallingIdentity();
             try {
@@ -738,10 +717,6 @@
         }
     }
 
-    boolean isSplitScreenMinimized() {
-        return mSplitScreenMinimized;
-    }
-
     boolean isWallpaperVisible(WindowState w) {
         return w != null && w.mAttrs.type == TYPE_BASE_APPLICATION &&
                 ((w.mActivityRecord != null && mTargetActivityRecord == w.mActivityRecord)
@@ -944,7 +919,6 @@
         pw.print(innerPrefix); pw.println("mPendingAnimations=" + mPendingAnimations.size());
         pw.print(innerPrefix); pw.println("mCanceled=" + mCanceled);
         pw.print(innerPrefix); pw.println("mInputConsumerEnabled=" + mInputConsumerEnabled);
-        pw.print(innerPrefix); pw.println("mSplitScreenMinimized=" + mSplitScreenMinimized);
         pw.print(innerPrefix); pw.println("mTargetActivityRecord=" + mTargetActivityRecord);
         pw.print(innerPrefix); pw.println("isTargetOverWallpaper=" + isTargetOverWallpaper());
         pw.print(innerPrefix); pw.println("mRequestDeferCancelUntilNextTransition="
diff --git a/services/core/java/com/android/server/wm/RootWindowContainer.java b/services/core/java/com/android/server/wm/RootWindowContainer.java
index 64d7db2..855da61 100644
--- a/services/core/java/com/android/server/wm/RootWindowContainer.java
+++ b/services/core/java/com/android/server/wm/RootWindowContainer.java
@@ -1011,9 +1011,7 @@
         // Send any pending task-info changes that were queued-up during a layout deferment
         mWmService.mAtmService.mTaskOrganizerController.dispatchPendingTaskInfoChanges();
 
-        if (DEBUG_WINDOW_TRACE) Slog.e(TAG,
-                "performSurfacePlacementInner exit: animating="
-                        + mWmService.mAnimator.isAnimating());
+        if (DEBUG_WINDOW_TRACE) Slog.e(TAG, "performSurfacePlacementInner exit");
     }
 
     private void checkAppTransitionReady(WindowSurfacePlacer surfacePlacer) {
@@ -1989,8 +1987,7 @@
         // We dismiss the docked stack whenever we switch users.
         final ActivityStack dockedStack = getDefaultDisplay().getRootSplitScreenPrimaryTask();
         if (dockedStack != null) {
-            mStackSupervisor.moveTasksToFullscreenStackLocked(
-                    dockedStack, dockedStack.isFocusedStackOnDisplay());
+            getDefaultDisplay().onSplitScreenModeDismissed();
         }
         // Also dismiss the pinned stack whenever we switch users. Removing the pinned stack will
         // also cause all tasks to be moved to the fullscreen stack at a position that is
diff --git a/services/core/java/com/android/server/wm/Task.java b/services/core/java/com/android/server/wm/Task.java
index 76805e9..b81cc91 100644
--- a/services/core/java/com/android/server/wm/Task.java
+++ b/services/core/java/com/android/server/wm/Task.java
@@ -2036,18 +2036,6 @@
         intersectWithInsetsIfFits(outStableBounds, mTmpBounds, mTmpInsets);
     }
 
-    /**
-     * Asks docked-divider controller for the smallestwidthdp given bounds.
-     * @param bounds bounds to calculate smallestwidthdp for.
-     */
-    private int getSmallestScreenWidthDpForDockedBounds(Rect bounds) {
-        DisplayContent dc = getDisplayContent();
-        if (dc != null) {
-            return dc.getDockedDividerController().getSmallestWidthDpForBounds(bounds);
-        }
-        return Configuration.SMALLEST_SCREEN_WIDTH_DP_UNDEFINED;
-    }
-
     void computeConfigResourceOverrides(@NonNull Configuration inOutConfig,
             @NonNull Configuration parentConfig) {
         computeConfigResourceOverrides(inOutConfig, parentConfig, null /* compatInsets */);
diff --git a/services/core/java/com/android/server/wm/WindowAnimator.java b/services/core/java/com/android/server/wm/WindowAnimator.java
index fd91bc5..b6be386 100644
--- a/services/core/java/com/android/server/wm/WindowAnimator.java
+++ b/services/core/java/com/android/server/wm/WindowAnimator.java
@@ -50,7 +50,6 @@
     final WindowManagerPolicy mPolicy;
 
     /** Is any window animating? */
-    private boolean mAnimating;
     private boolean mLastRootAnimating;
 
     final Choreographer.FrameCallback mAnimationFrameCallback;
@@ -135,7 +134,6 @@
         synchronized (mService.mGlobalLock) {
             mCurrentTime = frameTimeNs / TimeUtils.NANOS_PER_MS;
             mBulkUpdateParams = SET_ORIENTATION_CHANGE_COMPLETE;
-            mAnimating = false;
             if (DEBUG_WINDOW_TRACE) {
                 Slog.i(TAG, "!!! animate: entry time=" + mCurrentTime);
             }
@@ -160,17 +158,12 @@
                     final DisplayContent dc = mService.mRoot.getDisplayContent(displayId);
 
                     dc.checkAppWindowsReadyToShow();
-                    orAnimating(dc.getDockedDividerController().animate(mCurrentTime));
                     if (accessibilityController != null) {
                         accessibilityController.drawMagnifiedRegionBorderIfNeededLocked(displayId,
                                 mTransaction);
                     }
                 }
 
-                if (!mAnimating) {
-                    cancelAnimation();
-                }
-
                 if (mService.mWatermark != null) {
                     mService.mWatermark.drawIfNeeded();
                 }
@@ -220,7 +213,7 @@
             executeAfterPrepareSurfacesRunnables();
 
             if (DEBUG_WINDOW_TRACE) {
-                Slog.i(TAG, "!!! animate: exit mAnimating=" + mAnimating
+                Slog.i(TAG, "!!! animate: exit"
                         + " mBulkUpdateParams=" + Integer.toHexString(mBulkUpdateParams)
                         + " hasPendingLayoutChanges=" + hasPendingLayoutChanges);
             }
@@ -302,10 +295,6 @@
     private class DisplayContentsAnimator {
     }
 
-    boolean isAnimating() {
-        return mAnimating;
-    }
-
     boolean isAnimationScheduled() {
         return mAnimationFrameCallbackScheduled;
     }
@@ -314,14 +303,6 @@
         return mChoreographer;
     }
 
-    void setAnimating(boolean animating) {
-        mAnimating = animating;
-    }
-
-    void orAnimating(boolean animating) {
-        mAnimating |= animating;
-    }
-
     /**
      * Adds a runnable to be executed after {@link WindowContainer#prepareSurfaces} is called and
      * the corresponding transaction is closed and applied.
diff --git a/services/core/java/com/android/server/wm/WindowManagerService.java b/services/core/java/com/android/server/wm/WindowManagerService.java
index e0f8f0e..a59eab5 100644
--- a/services/core/java/com/android/server/wm/WindowManagerService.java
+++ b/services/core/java/com/android/server/wm/WindowManagerService.java
@@ -42,7 +42,6 @@
 import static android.provider.Settings.Global.DEVELOPMENT_RENDER_SHADOWS_IN_COMPOSITOR;
 import static android.view.Display.DEFAULT_DISPLAY;
 import static android.view.Display.INVALID_DISPLAY;
-import static android.view.WindowManager.DOCKED_INVALID;
 import static android.view.WindowManager.LayoutParams.FIRST_APPLICATION_WINDOW;
 import static android.view.WindowManager.LayoutParams.FIRST_SUB_WINDOW;
 import static android.view.WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM;
@@ -59,7 +58,6 @@
 import static android.view.WindowManager.LayoutParams.SYSTEM_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS;
 import static android.view.WindowManager.LayoutParams.TYPE_ACCESSIBILITY_OVERLAY;
 import static android.view.WindowManager.LayoutParams.TYPE_APPLICATION_STARTING;
-import static android.view.WindowManager.LayoutParams.TYPE_DOCK_DIVIDER;
 import static android.view.WindowManager.LayoutParams.TYPE_DREAM;
 import static android.view.WindowManager.LayoutParams.TYPE_INPUT_METHOD;
 import static android.view.WindowManager.LayoutParams.TYPE_INPUT_METHOD_DIALOG;
@@ -214,7 +212,6 @@
 import android.view.IDisplayWindowInsetsController;
 import android.view.IDisplayWindowListener;
 import android.view.IDisplayWindowRotationController;
-import android.view.IDockedStackListener;
 import android.view.IInputFilter;
 import android.view.IOnKeyguardExitResult;
 import android.view.IPinnedStackListener;
@@ -1636,14 +1633,6 @@
                 }
             }
 
-            // If the window is being added to a stack that's currently adjusted for IME,
-            // make sure to apply the same adjust to this new window.
-            win.applyAdjustForImeIfNeeded();
-
-            if (type == TYPE_DOCK_DIVIDER) {
-                mRoot.getDisplayContent(displayId).getDockedDividerController().setWindow(win);
-            }
-
             final WindowStateAnimator winAnimator = win.mWinAnimator;
             winAnimator.mEnterAnimationPending = true;
             winAnimator.mEnteringAnimation = true;
@@ -2816,16 +2805,6 @@
         }
     }
 
-    void setDockedStackCreateStateLocked(int mode, Rect bounds) {
-        mDockedStackCreateMode = mode;
-        mDockedStackCreateBounds = bounds;
-    }
-
-    void checkSplitScreenMinimizedChanged(boolean animate) {
-        final DisplayContent displayContent = getDefaultDisplayContentLocked();
-        displayContent.getDockedDividerController().checkMinimizeChanged(animate);
-    }
-
     boolean isValidPictureInPictureAspectRatio(DisplayContent displayContent, float aspectRatio) {
         return displayContent.getPinnedStackController().isValidPictureInPictureAspectRatio(
                 aspectRatio);
@@ -3295,10 +3274,6 @@
 
             // Notify whether the docked stack exists for the current user
             final DisplayContent displayContent = getDefaultDisplayContentLocked();
-            final ActivityStack stack =
-                    displayContent.getRootSplitScreenPrimaryTask();
-            displayContent.mDividerControllerLocked.notifyDockedStackExistsChanged(
-                    stack != null && stack.hasTaskForUser(newUserId));
 
             mRoot.forAllDisplays(dc -> dc.mAppTransition.setCurrentUser(newUserId));
 
@@ -4687,7 +4662,7 @@
         public static final int RESET_ANR_MESSAGE = 38;
         public static final int WALLPAPER_DRAW_PENDING_TIMEOUT = 39;
 
-        public static final int UPDATE_DOCKED_STACK_DIVIDER = 41;
+        public static final int UPDATE_MULTI_WINDOW_STACKS = 41;
 
         public static final int WINDOW_REPLACEMENT_TIMEOUT = 46;
 
@@ -4832,7 +4807,7 @@
                     synchronized (mGlobalLock) {
                         // Since we're holding both mWindowMap and mAnimator we don't need to
                         // hold mAnimator.mLayoutToAnim.
-                        if (mAnimator.isAnimating() || mAnimator.isAnimationScheduled()) {
+                        if (mAnimator.isAnimationScheduled()) {
                             // If we are animating, don't do the gc now but
                             // delay a bit so we don't interrupt the animation.
                             sendEmptyMessageDelayed(H.FORCE_GC, 2000);
@@ -4994,11 +4969,10 @@
                     }
                     break;
                 }
-                case UPDATE_DOCKED_STACK_DIVIDER: {
+                case UPDATE_MULTI_WINDOW_STACKS: {
                     synchronized (mGlobalLock) {
                         final DisplayContent displayContent = getDefaultDisplayContentLocked();
                         if (displayContent != null) {
-                            displayContent.getDockedDividerController().reevaluateVisibility(false);
                             displayContent.adjustForImeIfNeeded();
                         }
                     }
@@ -6551,11 +6525,7 @@
 
     @Override
     public int getDockedStackSide() {
-        synchronized (mGlobalLock) {
-            final ActivityStack dockedStack = getDefaultDisplayContentLocked()
-                    .getRootSplitScreenPrimaryTask();
-            return dockedStack == null ? DOCKED_INVALID : dockedStack.getDockSide();
-        }
+        return 0;
     }
 
     void setDockedStackResizing(boolean resizing) {
@@ -6572,14 +6542,6 @@
         }
     }
 
-    @Override
-    public void setResizeDimLayer(boolean visible, int targetWindowingMode, float alpha) {
-        synchronized (mGlobalLock) {
-            getDefaultDisplayContentLocked().getDockedDividerController().setResizeDimLayer(
-                    visible, targetWindowingMode, alpha);
-        }
-    }
-
     void setForceDesktopModeOnExternalDisplays(boolean forceDesktopModeOnExternalDisplays) {
         synchronized (mGlobalLock) {
             mForceDesktopModeOnExternalDisplays = forceDesktopModeOnExternalDisplays;
@@ -6598,17 +6560,6 @@
     }
 
     @Override
-    public void registerDockedStackListener(IDockedStackListener listener) {
-        mAtmInternal.enforceCallerIsRecentsOrHasPermission(REGISTER_WINDOW_MANAGER_LISTENERS,
-                "registerDockedStackListener()");
-        synchronized (mGlobalLock) {
-            // TODO(multi-display): The listener is registered on the default display only.
-            getDefaultDisplayContentLocked().mDividerControllerLocked.registerDockedStackListener(
-                    listener);
-        }
-    }
-
-    @Override
     public void registerPinnedStackListener(int displayId, IPinnedStackListener listener) {
         if (!checkCallingPermission(REGISTER_WINDOW_MANAGER_LISTENERS,
                 "registerPinnedStackListener()")) {
diff --git a/services/core/java/com/android/server/wm/WindowState.java b/services/core/java/com/android/server/wm/WindowState.java
index 37597fb..b0729a2 100644
--- a/services/core/java/com/android/server/wm/WindowState.java
+++ b/services/core/java/com/android/server/wm/WindowState.java
@@ -1128,7 +1128,6 @@
                 }
             }
         } else if (mAttrs.type == TYPE_DOCK_DIVIDER) {
-            dc.getDockedDividerController().positionDockedStackedDivider(windowFrames.mFrame);
             windowFrames.mContentFrame.set(windowFrames.mFrame);
             if (!windowFrames.mFrame.equals(windowFrames.mLastFrame)) {
                 mMovedByResize = true;
@@ -1937,13 +1936,9 @@
         // animating... let's do something.
         final int left = mWindowFrames.mFrame.left;
         final int top = mWindowFrames.mFrame.top;
-        final Task task = getTask();
-        final boolean adjustedForMinimizedDockOrIme = task != null
-                && (task.getStack().isAdjustedForMinimizedDockedStack()
-                || task.getStack().isAdjustedForIme());
         if (mToken.okToAnimate()
                 && (mAttrs.privateFlags & PRIVATE_FLAG_NO_MOVE_ANIMATION) == 0
-                && !isDragResizing() && !adjustedForMinimizedDockOrIme
+                && !isDragResizing()
                 && getWindowConfiguration().hasMovementAnimations()
                 && !mWinAnimator.mLastHidden
                 && !mSeamlesslyRotated) {
@@ -2412,13 +2407,6 @@
         }
     }
 
-    void applyAdjustForImeIfNeeded() {
-        final Task task = getTask();
-        if (task != null && task.getStack() != null && task.getStack().isAdjustedForIme()) {
-            task.getStack().applyAdjustForImeIfNeeded(task);
-        }
-    }
-
     @Override
     void switchUser(int userId) {
         super.switchUser(userId);
@@ -4308,10 +4296,6 @@
             }
         }
 
-        if (mAttrs.type == TYPE_INPUT_METHOD) {
-            getDisplayContent().mDividerControllerLocked.resetImeHideRequested();
-        }
-
         return true;
     }