Merge "Completely remove pinned task when starting a new PiP" into tm-dev

            final Task rootPinnedTask = taskDisplayArea.getRootPinnedTask();

            if (rootPinnedTask != null) {

                transitionController.collect(rootPinnedTask);

                rootPinnedTask.dismissPip();

                // The new ActivityRecord should replace the existing PiP, so it's more desirable

                // that the old PiP disappears instead of turning to full-screen at the same time,

                // as the Task#dismissPip is trying to do.

                removeRootTasksInWindowingModes(WINDOWING_MODE_PINNED);

            }

            // Set a transition to ensure that we don't immediately try and update the visibility