Entering KDL via custom shortcut keeps modifiers pressed after exit

[nephele]

I suspect this is because the modifier down event is before KDL is entered, and the up event is after kdl has been entered, so the input_server doesn't receive the up event.

hrev55005 (hrev55006+3 with 006 reverted) To reproduce:

• Define a shortcut of Alt+shift+caps_lock in Shortcuts for /bin/kernel_debugger
• trigger the shortcut
• use continue to get out of kdl

=> The shift key now behaves as if it were constantly pressed

[pulkomandy]

Making priority low because our KDL is already a thousand times better than what's available on other platforms