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Rui Matos authored
"The child window MUST also have the _NET_SUPPORTING_WM_CHECK property set to the ID of the child window. […] If the _NET_SUPPORTING_WM_CHECK window on the client window is missing or not properly set, clients SHOULD assume that no conforming Window Manager is present." This commit implements that, which allows us to not have to do a XGetWindowProperty() every N seconds when running under a compliant WM. This is also a more correct fix for the bug handled in commit daf29bff. https://bugzilla.gnome.org/show_bug.cgi?id=666921
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