Backport upstream fix to allow all keyboard layouts (!7) · Merge requests · GNOME / gdm3 · GitLab

Fixes 921457. Upstream bug: https://gitlab.gnome.org/GNOME/gdm/issues/433. Upstream commit: https://gitlab.gnome.org/GNOME/gdm/commit/3b9797d759b42b85be309a1b3cbbf52cb3e47de5