Stash taskbar on swipe to go home for 3p fallback launcher.

Fix: 269070986
Test: manual. Install launcher3WithoutQuickstepDebug and swipe to home from within an app.
Change-Id: I1fe3d48793644d35271440e40dd028dd64e6d0cf
diff --git a/quickstep/src/com/android/launcher3/taskbar/FallbackTaskbarUIController.java b/quickstep/src/com/android/launcher3/taskbar/FallbackTaskbarUIController.java
index c165750..9bcc804 100644
--- a/quickstep/src/com/android/launcher3/taskbar/FallbackTaskbarUIController.java
+++ b/quickstep/src/com/android/launcher3/taskbar/FallbackTaskbarUIController.java
@@ -77,13 +77,14 @@
 
     /**
      * Creates an animation to animate the taskbar for the given state (but does not start it).
-     * Currently this animation just force stashes the taskbar in Overview.
      */
     public Animator createAnimToRecentsState(RecentsState toState, long duration) {
-        boolean useStashedLauncherState = toState.hasOverviewActions();
-        boolean stashedLauncherState =
-                useStashedLauncherState && FeatureFlags.ENABLE_GRID_ONLY_OVERVIEW.get()
-                        && toState == RecentsState.MODAL_TASK;
+        // Force stash the taskbar in overview modal state or when going home.
+        boolean useStashedLauncherState =
+                toState.hasOverviewActions() || toState == RecentsState.HOME;
+        boolean stashedLauncherState = useStashedLauncherState && (
+                (FeatureFlags.ENABLE_GRID_ONLY_OVERVIEW.get() && toState == RecentsState.MODAL_TASK)
+                        || toState == RecentsState.HOME);
         TaskbarStashController stashController = mControllers.taskbarStashController;
         // Set both FLAG_IN_STASHED_LAUNCHER_STATE and FLAG_IN_APP to ensure the state is respected.
         // For all other states, just use the current stashed-in-app setting (e.g. if long clicked).