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
The gnome-shell magnifier listens to the `visibility-changed` signal and calls meta_cursor_tracker_set_pointer_visible(false) when the cursor became visible. This leads to a reentrance in meta_cursor_tracker_set_pointer_visible() and clutter_seat_uninhibit_unfocus() gets called twice, once from the meta_cursor_tracker_set_pointer_visible(false) by the magnifier and then the original meta_cursor_tracker_set_pointer_visible(true) continues, after the first call has set is_showing to false again. This breaks the inhibitor counting and the ability to use the cursor while using the magnifier. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3661>