Unstash hotseat immediately if go out of the launcher home.

When navigation mode is set to 3 buttons, it is possible for user to
click on recent apps button, so for such scenario taskbar should be
immediately un-stashed

Test: Manual
Set 3 buttons navigation mode. Go to Launcher home. Expand bubble bar.
Press recent apps button. Press the home button. Observe hotseat is
visible. Video:
http://recall/-/gx8ASgewUeUS3QYohfrd1J/fX0gSp18Riw8mYYAw0wj8W

Bug: 367488218
Flag: com.android.wm.shell.enable_bubble_bar
Change-Id: Id65fd9add720125a340294311d470f2be50d43f8

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

@@ -748,7 +748,8 @@ public class BubbleBarViewController {
 
     /**
      * Hides the persistent taskbar if it is going to intersect with the expanded bubble bar if in
-     * app or overview. Set the hotseat stashed state if on launcher home screen.
+     * app or overview. Set the hotseat stashed state if on launcher home screen. If not on launcher
+     * home screen and hotseat is stashed immediately un-stashes the hotseat.
      */
     private void adjustTaskbarAndHotseatToBubbleBarState(boolean isBubbleBarExpanded) {
         if (mBubbleStashController.isBubblesShowingOnHome()) {
@@ -760,6 +761,10 @@ public class BubbleBarViewController {
                     .animateToValue(hideTaskbar ? 0 : 1)
                     .start();
         }
+        if (!mBubbleStashController.isBubblesShowingOnHome()
+                && mTaskbarStashController.isHiddenForBubbles()) {
+            mTaskbarStashController.unStashHotseatInstantly();
+        }
     }
 
     /** Return {@code true} if expanded bubble bar would intersect the taskbar. */