Posted January 28, 2016
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And upstream it's here: https://github.com/liballeg/allegro5/issues/392
If you can make AGS match your screen resolution in windowed mode (I managed to do it for 1920x1200 using "6x nearest neighbor" filter that ags provides) - the best workaround is to run it like that and then turn it into fullscreen with your window manager (KDE allows that and you can even set a persistent window rule like that). This way grabbing of keyboard shortcuts doesn't happen.
Related: https://forum.kde.org/viewtopic.php?f=111&t=121907