Comment 37 for bug 776435

Another brainstorm:

This bug can also be triggered by Grid and needs to be finally fixed in 0.9.10.
Unfortunately this involves manipulating the core, which makes testing the fix properly a bit harder without fully installing the self-compiled Compiz...
Nevertheless the fix itself should not be hard to implement -> the logic just needs to be changed to always semi-maximize/maximize on the output device containing the pointer, not the output device, on which the biggest part of the window resides when it is semi-maximized/maximized.
For plugins using this function this change could be problematic, maybe the best solution would be to create a new function with the old behaviour and make all plugins call that instead, so the behaviour for them won't change, while maximizing and semimaximizing would use the new function...