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The background is in https://gitlab.gnome.org/GNOME/gtk/issues/85 . One of
the conclusions, in https://gitlab.gnome.org/GNOME/gtk/issues/85#note_264804
, is that mate-panel needs to properly transfer focus on alt-F1 keyboard
shortcut.
It used to work only by luck before, only because gtk used to
deactivate itself during a keyboard grab. But as discussed in
https://gitlab.gnome.org/GNOME/gtk/issues/85 that behavior poses
accessibility feedback issues, is not coherent, and keyboard grab
feedback will not be available in wayland anyway. Thus @ebassi saying
in https://gitlab.gnome.org/GNOME/gtk/issues/85#note_264804 that not
transferring focus properly is the actual bug.
This change explictly switches to the menu bar after saving which X Window
had the focus, and on menu bar deactivation restores focus to that X Window.
Fixes #851
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