Created attachment 58335 [details]
Remember X11 keycodes/modifiers grabbed for Qt keycodes so as to ungrab the same values

Version:           unspecified (using KDE 4.4.5) 
OS:                Linux

This is rather a bug in kdebase-runtime/kglobalaccel, but there's no bugzilla category for that.

It goes like this:
Kglobalaccel wants to register the Print key.
The X11 implementation (kglobalaccel_x11) looks up the X11 keycode for that Qt key, result is 107. It XGrabKey()s 107.
Later, the mapping changes. Kglobalaccel now unregisters all keys in order re-register them later.
Kglobalaccel unregisters the Print Key.
The X11 implementation looks up the X11 keycode, now being 111. It XUngrabKey()s 111.
This leaves 107 (which now is the Delete/,,Entfernen'' Key) still grabbed and thus non-functional.

Since this is a race condition between shortcut registration and keyboard mapping, it seems to appear randomly.

The obvious fix is making kglobalaccel_x11 remember the X11 keycodes/modifiers it grabbed according to Qt kecodes.
This is my first encounter with QLists plus I'm not familiar with C++, but surprisingly, my fix works.

Reproducible: Sometimes

Steps to Reproduce:
In xorg.conf, select a german keyboard model and layout (i.e. pc105, de).
Start xev.
Press ,,Entfernen''.

Actual Results:  
keymapstate event

Expected Results:  
keypressed event

This is the infamous ,,Entfernen-Taste funktionierrt nicht/Delete Key doesn't work'' bug.