Put dismiss end target at navigation bar

This makes the animation when exiting docked mode a bit nicer
when you fling the divider towards to the navigation bar. However,
since the divider ends at the navigation bar, we need to immediately
dismiss it instead of fading out when the divider is fully occluded
by the navigation bar.

Change-Id: Ic5432fd118cb71be36485667b2c537caf5065ce5
diff --git a/services/core/java/com/android/server/policy/PhoneWindowManager.java b/services/core/java/com/android/server/policy/PhoneWindowManager.java
index a92cc31..c046ba6 100644
--- a/services/core/java/com/android/server/policy/PhoneWindowManager.java
+++ b/services/core/java/com/android/server/policy/PhoneWindowManager.java
@@ -2645,11 +2645,7 @@
                 }
             }
         } else if (win.getAttrs().type == TYPE_DOCK_DIVIDER) {
-            if (transit == TRANSIT_ENTER || transit == TRANSIT_SHOW) {
-                return R.anim.fade_in;
-            } else if (transit == TRANSIT_EXIT) {
-                return R.anim.fade_out;
-            }
+            return selectDockedDividerAnimationLw(win, transit);
         }
 
         if (transit == TRANSIT_PREVIEW_DONE) {
@@ -2669,6 +2665,24 @@
         return 0;
     }
 
+    private int selectDockedDividerAnimationLw(WindowState win, int transit) {
+        int insets = mWindowManagerFuncs.getDockedDividerInsetsLw();
+
+        // If the divider is behind the navigation bar, don't animate.
+        if (mNavigationBar != null
+                && (win.getFrameLw().top + insets >= mNavigationBar.getFrameLw().top
+                        || win.getFrameLw().left + insets >= mNavigationBar.getFrameLw().left)) {
+            return 0;
+        }
+        if (transit == TRANSIT_ENTER || transit == TRANSIT_SHOW) {
+            return R.anim.fade_in;
+        } else if (transit == TRANSIT_EXIT) {
+            return R.anim.fade_out;
+        } else {
+            return 0;
+        }
+    }
+
     @Override
     public void selectRotationAnimationLw(int anim[]) {
         if (PRINT_ANIM) Slog.i(TAG, "selectRotationAnimation mTopFullscreen="