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x11: Bypass GTK on XFixesSelectionNotify

Carlos Garnacho requested to merge carlosg/mutter:wip/carlosg/bypass-gtk-xfixesselectionnotify into main

In GTK this is only used for GTK clipboard/DnD selections, and finding out whether there is a compositing manager in charge. In Mutter, we manage our own clipboard/DnD selections, and don't perform any rendering through GTK in the Mutter process.

So there's no special reason to let these events go through GTK, and (related to xwayland-on-demand?) there may be race conditions in the handling of the second feature.

There's a chance this race condition may be in Mutter, but it does not sound worth to chase this race condition when we can let GTK ignore these events. And it does not make sense to "fix" gtk3 for this Mutter-only condition, when we intend to eventually avoid it.

So, take the easy path and ignore these events.

Closes: #2617 (closed)

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