Unminimized non gtk windows don't have the focus

In Trusty 14.04, every time a non gtk app (e.g. native X Window apps, Qt apps, Wine apps, FOX apps, etc.) is unminimized, its window comes to the front as expected but doesn't have the focus. So I need to click once again on the task list button or on the window itself to get the focus on it.

To reproduce :
1. start any non gtk app (ex: xcalc) => it comes to the front and has the focus
2. minimize it
3. unminimize it => it comes to the front but doesn't have the focus

System: Ubuntu 14.04 LTS
Package: compiz 1:0.9.11+14.04.20140423-0ubuntu1