Make sure the workspace screens don't get updated while workspace is loading

-> Found another path that could lead to the same issue
   [add shortcut with config activity to an existing folder,
   when config activity launches, kill launcher, configure
   shortcut. observe crash and data loss].
-> Plugged up above, and a couple other potential holes
-> Initial fix probably took care of the main issue

Issue 12523285

Change-Id: I29db9da4af4a8bf22047eb46bd49354447d04b8d