When putting a window in fullscreen (ALT+F11) mode, it can still be resized with
(alt+rightclick).

Reproducible: Always
Steps to Reproduce:
1. Set the keyboard configuration of the window manager to "default", otherwise
the keyboard shortcut ALT+F11, could be different
2. Open any program that use a window (firefox, xterm, rxvt)
3. Put it into focus (click on it)
4. Hit ALT+F11 to put the window in fullscreen mode
5. Hold down alt
6. Hold down your right mouse button
7. Move your mouse
8. Release alt and right mouse button
Actual Results:  
The window was resized.

Expected Results:  
The software should have not resized the window. (a.k.a. The software should
have done anything)

The keyboard shortcut provided here for putting fullscreen mode in the windows
was ALT+F11 (the default value), it could be different depending on the user
configuration.