gui app : Fix copy and paste on Windows #5511
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It seems that Windows or Qt on Windows emits an extra update signal when copying to the clipboard, thwarting our attempt at not receiving the Qt clipboard update event when syncing the Gaffer clipboard. By checking to make sure there is a real change to make, we don't clobber the Gaffer clipboard's stored `IECore::Object` with a string. Fixes GafferHQ#5485
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It seems that Windows or Qt on Windows emits an extra update signal when copying to the clipboard, thwarting our attempt at not receiving the Qt clipboard update event when syncing the Gaffer clipboard. By checking to make sure there is a real change to make, we don't clobber the Gaffer clipboard's stored
IECore::Objectwith a string.Fixes #5485
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