How to change default umask in gnome 3.22?

"Garrett R." <[email protected]> Mon, 7 Aug 2017 16:58:32 +0000 (GMT)

Newsgroups	gmane.comp.gnome.general
Message-ID	<[email protected]>

I login to session with GDM. I then open gedit. Documents I save all have rw-r--r--.

I have tried setting umask to 077 at /etc/login.defs, ~/.profile, ~/.gnomerc, ~/.xsessionrc. None of these have any effect.

It appears systemd now manages umask in gnome 3.22. Can someone please describe how I can change the default umask setting?