Revert "Clear transitions for app windows display change."

This reverts commit 110ed21087.

Reason for revert: CTS failure b/135655256

Bug: 135655256
Bug: 128449959

Change-Id: I9b36d34193e1c9e228be609a7b10457392fd6aa3

services/core/java/com/android/server/wm/AppWindowToken.java

@@ -1322,9 +1322,7 @@ class AppWindowToken extends WindowToken implements WindowManagerService.AppFree
         if (prevDc == null || prevDc == mDisplayContent) {
             return;
         }
-
-        prevDc.mOpeningApps.remove(this);
-        if (prevDc.mChangingApps.remove(this)) {
+        if (prevDc.mChangingApps.contains(this)) {
             // This gets called *after* the AppWindowToken has been reparented to the new display.
             // That reparenting resulted in this window changing modes (eg. FREEFORM -> FULLSCREEN),
             // so this token is now "frozen" while waiting for the animation to start on prevDc
@@ -1333,8 +1331,6 @@ class AppWindowToken extends WindowToken implements WindowManagerService.AppFree
             // so we need to cancel the change transition here.
             clearChangeLeash(getPendingTransaction(), true /* cancel */);
         }
-        prevDc.mClosingApps.remove(this);
-
         if (prevDc.mFocusedApp == this) {
             prevDc.setFocusedApp(null);
             final TaskStack stack = dc.getTopStack();
@@ -3220,6 +3216,16 @@ class AppWindowToken extends WindowToken implements WindowManagerService.AppFree
                 true /* topToBottom */);
     }
 
+    void removeFromPendingTransition() {
+        if (isWaitingForTransitionStart() && mDisplayContent != null) {
+            mDisplayContent.mOpeningApps.remove(this);
+            if (mDisplayContent.mChangingApps.remove(this)) {
+                clearChangeLeash(getPendingTransaction(), true /* cancel */);
+            }
+            mDisplayContent.mClosingApps.remove(this);
+        }
+    }
+
     private void updateColorTransform() {
         if (mSurfaceControl != null && mLastAppSaturationInfo != null) {
             getPendingTransaction().setColorTransform(mSurfaceControl,

services/core/java/com/android/server/wm/DisplayContent.java

@@ -2377,6 +2377,9 @@ class DisplayContent extends WindowContainer<DisplayContent.DisplayChildWindowCo
                     + " to its current displayId=" + mDisplayId);
         }
 
+        // Clean up all pending transitions when stack reparent to another display.
+        stack.forAllAppWindows(AppWindowToken::removeFromPendingTransition);
+
         prevDc.mTaskStackContainers.removeChild(stack);
         mTaskStackContainers.addStackToDisplay(stack, onTop);
     }