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When used it setups an X11 event monitor that replies to WM_TAKE_FOCUS ClientMessage's with a XSetInputFocus request. It can only be used by x11 clients on windows that have WM_TAKE_FOCUS atom set and that does not accept input. https://gitlab.gnome.org/GNOME/mutter/merge_requests/669 (cherry picked from commit b80250e483e20bc2b66aa0117af0c442875c1b74)
Mutter
Mutter is a Wayland display server and X11 window manager and compositor library.
When used as a Wayland display server, it runs on top of KMS and libinput. It implements the compositor side of the Wayland core protocol as well as various protocol extensions. It also has functionality related to running X11 applications using Xwayland.
When used on top of Xorg it acts as a X11 window manager and compositing manager.
It contains functionality related to, among other things, window management, window compositing, focus tracking, workspace management, keybindings and monitor configuration.
Internally it uses a fork of Cogl, a hardware acceleration abstraction library used to simplify usage of OpenGL pipelines, as well as a fork af Clutter, a scene graph and user interface toolkit.
Mutter is used by GNOME Shell, the GNOME core user interface. It can also be run standalone, using the command "mutter", but just running plain mutter is only intended for debugging purposes.
License
Mutter is distributed under the terms of the GNU General Public License, version 2 or later. See the COPYING file for detalis.