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I have set the right windows key as dead_greek via xmodmap.
This works great in Qt, GTK3 and non-toolkit apps, but not in GTK2 apps (Firefox, Thunderbird, Pluma, etc.).
Any ideas on how to make it work in GTK2 apps?
This is my .Xmodmap:
remove Mod4 = Super_R
keycode 134 = dead_greek NoSymbol Super_ROffline