Fix for transparent CustomContent screen (issue 11549096)

Change-Id: I8b371e3c556a80b7eb3e145a8d4b78f15421046a
diff --git a/src/com/android/launcher3/Workspace.java b/src/com/android/launcher3/Workspace.java
index 9b6784c..558519f 100644
--- a/src/com/android/launcher3/Workspace.java
+++ b/src/com/android/launcher3/Workspace.java
@@ -2336,7 +2336,9 @@
     void hideCustomContentIfNecessary() {
         boolean hide  = mState != Workspace.State.NORMAL;
         if (hide && hasCustomContent()) {
+            disableLayoutTransitions();
             mWorkspaceScreens.get(CUSTOM_CONTENT_SCREEN_ID).setVisibility(INVISIBLE);
+            enableLayoutTransitions();
         }
     }