Close system windows when triggering alt-tab

Bug: 148168572
Change-Id: I3488509eb0c9fd3c407653ba550c89f4259f98d0
diff --git a/quickstep/recents_ui_overrides/src/com/android/quickstep/OverviewCommandHelper.java b/quickstep/recents_ui_overrides/src/com/android/quickstep/OverviewCommandHelper.java
index c4733bd..fc50660 100644
--- a/quickstep/recents_ui_overrides/src/com/android/quickstep/OverviewCommandHelper.java
+++ b/quickstep/recents_ui_overrides/src/com/android/quickstep/OverviewCommandHelper.java
@@ -74,6 +74,10 @@
 
     @BinderThread
     public void onOverviewShown(boolean triggeredFromAltTab) {
+        if (triggeredFromAltTab) {
+            ActivityManagerWrapper.getInstance()
+                    .closeSystemWindows(CLOSE_SYSTEM_WINDOWS_REASON_RECENTS);
+        }
         MAIN_EXECUTOR.execute(new ShowRecentsCommand(triggeredFromAltTab));
     }