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One can add a wl_global filter to a wl_display instance, which can be used to decide what clients should see what globals. This has so far been used to limit a Xwayland specific protocol extension to only Xwayland. In order to expand the logic about what globals are filtered to what clients, introduce a filter manager and port the Xwayland specific protocol filter to this new manager. Tests are added, using a new dummy protocol, to ensure that filtering is working as expected. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2810>