I fell like something changed in the way the tasklist handle multiple grouped windows. I think before the update, when I had 2 instances of any application running, when clicking on the app on the tasklist it would have opened the last instance of the app that was in focus. Now it open the last instance of the app that was launched. This is a bit strange when switching between two things.
If I may be more concrete, when doing the following:
-open terminal 1
-open terminal 2
-put terminal 1 in focus again
-open firefox
-click on terminal on the tasklist
Before the update, I fell like it would have brought up terminal 1 which was the last in focus. Now, it brings up terminal 2.
This is a bit disturbing, and it seems to me that the old behaviour is more logical.
EDIT: I got it backward, it opens the first instance of the app launched. Anyway I feel like it should open the last one in focus.
