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Improve (especially remote) window dragging and resizing performance

Ian Henderson requested to merge ianh/quartz-wm:master into master

Before this change, every window operation with the potential to affect the _NET_WM_STATE property would end up calling XChangeProperty(), even if the property didn't actually change. This would cause an avalanche of PropertyNotify events, to which GTK-based apps, at least, dutifully respond with a GetProperty request. The connection is then overwhelmed with these requests.

The fix made here is to remember the last value of _NET_WM_STATE that was set, returning early if the new value is equal to the last value.

Edited by Ian Henderson

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