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gtk-primary-selection: basic serial validation #1429
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I've discovered that some clients rely on the compositor for rejecting
set_selectionrequests if the serial is invalid. For instance Gedit under Wayland issues multipleset_selectionrequests with the same serial, and not doing this basic serial validation will break clipboard.While I haven't found any clients broken for primary selection, it's probably better to add back this basic serial validation, at least until we have a new improved validation mechanism.