Carlos Garnacho c13d44439f popupMenu: Avoid intermediate focus changes on menu switch
Currently when switching from a popup menu to another in the same
manager, we first show the new menu, then hide the old menu and
remove its grab, then create a new grab for the just shown menu.

This briefly ungrabbed moment will still trigger keyboard focus
changes, that might have other visible effects. In order to fix
this, change the grabbing order so first the new grab is created
then the old one is dismissed. This ensures focus moves from the
old menu to the new menu without gaps in between.

Since a grab is tied to an active menu, but close/grab are now
slightly decoupled, also ensure closing a menu only tears down its
own grab. This is necessary for correct accounting while doing the
grab shuffling.

Closes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5039
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2166>
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GNOME Shell

GNOME Shell provides core user interface functions for the GNOME desktop, like switching to windows and launching applications. GNOME Shell takes advantage of the capabilities of modern graphics hardware and introduces innovative user interface concepts to provide a visually attractive and easy to use experience.

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