Merge "Allow other app enter PiP when exiting current one" into tm-qpr-dev

libs/WindowManager/Shell/src/com/android/wm/shell/pip/PipTaskOrganizer.java

@@ -966,7 +966,7 @@ public class PipTaskOrganizer implements ShellTaskOrganizer.TaskListener,
         // Re-set the PIP bounds to none.
         mPipBoundsState.setBounds(new Rect());
         mPipUiEventLoggerLogger.setTaskInfo(null);
-        mMainExecutor.executeDelayed(() -> mPipMenuController.detach(), 0);
+        mPipMenuController.detach();
         mLeash = null;
 
         if (info.displayId != Display.DEFAULT_DISPLAY && mOnDisplayIdChangeCallback != null) {

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

@@ -4465,6 +4465,14 @@ class Task extends TaskFragment {
             // transferring the transform on the leash to the task, reset this state once we're
             // moving out of pip
             setCanAffectSystemUiFlags(true);
+            // Turn on userLeaveHint so other app can enter PiP mode.
+            mTaskSupervisor.mUserLeaving = true;
+            // Allow entering PiP from current top most activity when we are leaving PiP.
+            final Task topFocused = mRootWindowContainer.getTopDisplayFocusedRootTask();
+            if (topFocused != null) {
+                final ActivityRecord ar = topFocused.getTopResumedActivity();
+                enableEnterPipOnTaskSwitch(ar, null /* toFrontTask */, ar, null /* opts */);
+            }
             mRootWindowContainer.notifyActivityPipModeChanged(this, null);
         }
         if (likelyResolvedMode == WINDOWING_MODE_PINNED) {