Merge "Don't show the bubble bar when it is empty" into udc-qpr-dev am: 7dd280eef3

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/24024252

Change-Id: I7c6a545a1fc71ccbb74d97f702a6a9bc04852ac0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>

quickstep/src/com/android/launcher3/taskbar/bubbles/BubbleStashController.java

@@ -125,6 +125,12 @@ public class BubbleStashController {
     public void setBubblesShowingOnHome(boolean onHome) {
         if (mBubblesShowingOnHome != onHome) {
             mBubblesShowingOnHome = onHome;
+
+            if (!mBarViewController.isBubbleBarVisible()) {
+                // if the bubble bar is not visible, there are no bubbles, so just return.
+                return;
+            }
+
             if (mBubblesShowingOnHome) {
                 showBubbleBar(/* expanded= */ false);
                 // When transitioning from app to home the stash animator may already have been