Remove relayouts
b/29945805

> Workspace relayout occurs when window flag is set to
change the status bar. This should not cause AllAppsTransitionController
to be initialized.
> Setting/Unsetting background drawables on the hotseat
also causes unnecessary layout. Fix this issue.

Change-Id: I73a3bfd3eb4bc34cf6760ffbd9826e3fef867056
diff --git a/src/com/android/launcher3/Hotseat.java b/src/com/android/launcher3/Hotseat.java
index b2f24be..b75d2c0 100644
--- a/src/com/android/launcher3/Hotseat.java
+++ b/src/com/android/launcher3/Hotseat.java
@@ -220,11 +220,10 @@
     }
 
     public void setBackgroundTransparent(boolean enable) {
-        // This causes re-layout. Should replace the logic with simply setting the background alpha
         if (enable) {
-            setBackground(null);
+            mBackground.setAlpha(0);
         } else {
-            setBackground(mBackground);
+            mBackground.setAlpha(255);
         }
     }