Blender Git Loki

Bugfix #33803

(2.65a and older)

Case: ALT+CTRL+U (user prefs) made mousewheel change button values in inactive
window.

On opening 2nd window, or de-activating a window, the modifier
state was kept for that window. That meant that mouse-over in a window was using
the old modifier - for example for scrollwheel it would change values
in buttons.