Synchronize the app launch and taskbar stash animations.

Introduce FLAG_IGNORE_IN_APP to prevent taskbar from stashing
prematurely due to HomeTransitionListener signal.

Fixes leak by adding event callback to clear runnable when launcher is
destroyed.

Bug: 319162553
Test: Launch an app, note the two animations are synced
      Verified by locally introducing a startDelay (since otherwise it is hard to tell)
Flag: com.android.launcher3.sync_app_launch_with_taskbar_stash
Change-Id: I684c714bb84fb1717b0e26620f2aa938671eb19a

quickstep/src/com/android/launcher3/taskbar/TaskbarStashController.java

@@ -23,6 +23,7 @@ import static com.android.app.animation.Interpolators.INSTANT;
 import static com.android.app.animation.Interpolators.LINEAR;
 import static com.android.internal.jank.InteractionJankMonitor.Configuration;
 import static com.android.launcher3.Flags.enableScalingRevealHomeAnimation;
+import static com.android.launcher3.Flags.syncAppLaunchWithTaskbarStash;
 import static com.android.launcher3.QuickstepTransitionManager.PINNED_TASKBAR_TRANSITION_DURATION;
 import static com.android.launcher3.config.FeatureFlags.ENABLE_TASKBAR_NAVBAR_UNIFICATION;
 import static com.android.launcher3.logging.StatsLogManager.LauncherEvent.LAUNCHER_TRANSIENT_TASKBAR_HIDE;
@@ -107,6 +108,8 @@ public class TaskbarStashController implements TaskbarControllers.LoggableTaskba
     // taskbar should always be stashed for bubble bar on phone
     public static final int FLAG_STASHED_BUBBLE_BAR_ON_PHONE = 1 << 15;
 
+    public static final int FLAG_IGNORE_IN_APP = 1 << 16; // used to sync with app launch animation
+
     // If any of these flags are enabled, isInApp should return true.
     private static final int FLAGS_IN_APP = FLAG_IN_APP | FLAG_IN_SETUP;
 
@@ -1412,6 +1415,13 @@ public class TaskbarStashController implements TaskbarControllers.LoggableTaskba
          */
         @Nullable
         public Animator createSetStateAnimator(long flags, long duration) {
+            // We do this when we want to synchronize the app launch and taskbar stash animations.
+            if (syncAppLaunchWithTaskbarStash()
+                    && hasAnyFlag(FLAG_IGNORE_IN_APP)
+                    && hasAnyFlag(flags, FLAG_IN_APP)) {
+                flags = flags & ~FLAG_IN_APP;
+            }
+
             boolean isStashed = mStashCondition.test(flags);
 
             if (DEBUG) {