Bugfix releasing a key that was pressed over another window (i.e. Shift) #7
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Bug: Open a Nodebox window, go to another X window, press "Shift" key, focus again on the Nodebox window with the mouse and release "Shift" key. Nodebox exits with a ValueError exception because the key is not in the _keys list of pressed keys.
Environment: Xubuntu Linux 14.04 (XFCE desktop)
Solution: ignore ValueError exceptions when removing keys from the _keys list