Correct stackstack typo

Changed function names that had stackstack to stack.

Test: go/wm_smoke
Bug: 68218244
Change-Id: I5792d657506fad615c2e4490796a85630ec74330
diff --git a/services/core/java/com/android/server/wm/DisplayContent.java b/services/core/java/com/android/server/wm/DisplayContent.java
index 4c6ab3f..fe34834 100644
--- a/services/core/java/com/android/server/wm/DisplayContent.java
+++ b/services/core/java/com/android/server/wm/DisplayContent.java
@@ -1452,17 +1452,17 @@
     /**
      * @return The primary split-screen stack, but only if it is visible, and {@code null} otherwise.
      */
-    TaskStack getSplitScreenPrimaryStackStack() {
-        TaskStack stack = mTaskStackContainers.getSplitScreenPrimaryStackStack();
+    TaskStack getSplitScreenPrimaryStack() {
+        TaskStack stack = mTaskStackContainers.getSplitScreenPrimaryStack();
         return (stack != null && stack.isVisible()) ? stack : null;
     }
 
     /**
-     * Like {@link #getSplitScreenPrimaryStackStack}, but also returns the stack if it's currently
+     * Like {@link #getSplitScreenPrimaryStack}, but also returns the stack if it's currently
      * not visible.
      */
-    TaskStack getSplitScreenPrimaryStackStackIgnoringVisibility() {
-        return mTaskStackContainers.getSplitScreenPrimaryStackStack();
+    TaskStack getSplitScreenPrimaryStackIgnoringVisibility() {
+        return mTaskStackContainers.getSplitScreenPrimaryStack();
     }
 
     TaskStack getPinnedStack() {
@@ -1877,7 +1877,7 @@
             mTouchExcludeRegion.op(mTmpRegion, Region.Op.UNION);
         }
         // TODO(multi-display): Support docked stacks on secondary displays.
-        if (mDisplayId == DEFAULT_DISPLAY && getSplitScreenPrimaryStackStack() != null) {
+        if (mDisplayId == DEFAULT_DISPLAY && getSplitScreenPrimaryStack() != null) {
             mDividerControllerLocked.getTouchRegion(mTmpRect);
             mTmpRegion.set(mTmpRect);
             mTouchExcludeRegion.op(mTmpRegion, Op.UNION);
@@ -2232,7 +2232,7 @@
         if (pinnedStack != null) {
             pw.println(prefix + "pinnedStack=" + pinnedStack.getName());
         }
-        final TaskStack splitScreenPrimaryStack = getSplitScreenPrimaryStackStack();
+        final TaskStack splitScreenPrimaryStack = getSplitScreenPrimaryStack();
         if (splitScreenPrimaryStack != null) {
             pw.println(prefix + "splitScreenPrimaryStack=" + splitScreenPrimaryStack.getName());
         }
@@ -3401,7 +3401,7 @@
             return mPinnedStack;
         }
 
-        TaskStack getSplitScreenPrimaryStackStack() {
+        TaskStack getSplitScreenPrimaryStack() {
             return mSplitScreenPrimaryStack;
         }