https://fedoraproject.org/wiki/How_to_debug_Wayland_problems
"Debugging mutter
You can debug mutter (used in gnome-shell) by setting its environment variables. These need to be set prior to run gnome-shell, so if you want to log into GNOME from GDM, you need to create a wrapper script called from a desktop file in /usr/share/wayland-sessions.
FIXME: Putting the wrapper script and desktop file here would be helpful."
Any chance anyone with time and interest to fix the fixme here?
You might want to ping jadahl or ofourdan (#fedora-desktop or #gtk+ on gimpnet), I believe I received that quoted info from one of them. If you receive more info on debugging mutter, please put it into the wiki, thanks.