62507c9759
When the user is doing a drag-and-drop, we want to temporarily show the stage to allow them to drag to a different window. But we're not "really" in the overview, and getting a grab would conflict with the X client doing the drag and drop. So add a showTemporarily()/hideTemporarily() pair of methods that show the overview without grabbing. This adds a lot more possibilities for asynchronous race conditions, so rework the code to be more robust against multiple calls to show*() and hide*(). The interpretation is now that all calls to show*() and hide*() affect the state, but if we have conflicting calls to show and hide we wait until the current animation is finished before correcting to the right visual state. https://bugzilla.gnome.org/show_bug.cgi?id=601731
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