evil-ex will scroll back another window
open emacs (evil-mode), C-x 2 to split window into two windows A and B. In window A, press C-M-v, to scroll forward window B while focus is still in A. Now press ":" (evil-ex), and you can see window B is scrolling back. That's not desired behaviour.
evil 20130208.1313 from melpa.
GNU Emacs 23.3.1 on ubuntu 12.0.? LTS