dual-monitor: windows wrongly moving from one monitor to another when activated from another viewport

Hi,

When using a multi-output (monitors) setup, windows moves spuriously between outputs when restarting compiz or activating a window from another viewport.

This is due to wrong parameters when calling outputDeviceForGeometry(…) in the function addWindowSizeChanges() in the file window.c.

I have an already made patch to propose to solve this issue.

Thanks,