Description of problem:
When I click on an item on, for example, a webpage link under firefox or a link in chrome, or Xterm, nothings happens. Hover events are not propagated to the app either. It seems that the mouse events are ignored by the apps as long as their window is on the primary screen. If I move firefox or chrome on the secondary screen, mouse events (click, hover, ... ) are registered properly.

Terminal, nautilus and native wayland apps are working properly. Xterm does not.

Version-Release number of selected component (if applicable):
xorg-x11-server-Xwayland 1.18.0-0.5.20150907.fc23

How reproducible:
Always

Steps to Reproduce:
1. Have a two display setup
2. Start firefox or Xterm and move it on differents screens
3. Move the on the different displays and notice how they don't react to mouse events on one of them

Actual results:
Nothing happens on any mouse event on one screen

Expected results:
Mouse events should not depend on the display they're aiming at.

Additional info:

Running f23 upgraded from fc22.