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.

source/blender/windowmanager/intern/wm_window.c

@@ -701,6 +701,14 @@ static int ghost_event_proc(GHOST_EventHandle evt, GHOST_TUserDataPtr C_void_ptr
 			case GHOST_kEventWindowDeactivate:
 				wm_event_add_ghostevent(wm, win, type, time, data);
 				win->active = 0; /* XXX */
+				
+				/* clear modifiers for inactive windows */
+				win->eventstate->alt = 0;
+				win->eventstate->ctrl = 0;
+				win->eventstate->shift = 0;
+				win->eventstate->oskey = 0;
+				win->eventstate->keymodifier = 0;
+
 				break;
 			case GHOST_kEventWindowActivate: 
 			{