Comment 4 for bug 287062

I'd like to confirm the problem, but I am not sure that the quick hack is the right solution. In the past, it was possible to "mirror" a larger screen over a smaller one (e.g. laptop 1400x1050, external monitor 1920x1200) The laptop just displayed the top left corner, which was fine with me. If the external monitor is larger than 1400x1400, one still needs the virtual line. So, the computation to make in case of mirroring would seem to be to take the max of the dimensions, and check that against the default bounds or the current virtual.