libmutter-3-0 - 3.30.2-9~deb10u1 main

Mutter is a small window manager, using GTK+ and Clutter to do
everything.
.
Mutter is the clutter-based evolution of Metacity, which, as the
author says, is a "Boring window manager for the adult in you. Many
window managers are like Marshmallow Froot Loops; Metacity is like
Cheerios."
.
This package contains the window manager shared library, used by mutter
itself, and gnome-shell.