Q: Messages app doesn't work in split view after 10.11.2 update

Apologies if this is addressed elsewhere, but this is an issue that popped up for me after i updated from El Capitan version 10.11.1 to version 10.11.2

Following the system update, the messages app no longer displays properly in split view.  I can put messages and a second app into split view like normal, but the messages window doesn't shrink to fit within its half of the screen (the second app sits on it's side of the screen and resizes like it should).   The messsages app instead continues to fill the entire screen, with the second app "window" either blocking that half of the messages window when the second app is active, or with the second app window hidden entirely by the messages app when messages is active.  Messages worked normally in split view in 10.11.1, it only started to have this problem when I upgraded to 10.11.2, and it only seems to be the messages app that's doing this.