This is what most GNOME modules now use instead of a shell script,
which makes sense given that the build system itself is written
in python.
This particular copy comes from nautilus ...
https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/920
Package managers usually take care of compiling GSettings schemas and
updating the .desktop database on installation, but when building
manually from source, we should perform the aforementioned actions
ourselves.
https://gitlab.gnome.org/GNOME/gnome-shell/issues/127