[Bug 1715722] [NEW] Allow safe override of GDM3 theme

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Currently, in artful, GDM3's theme is hardcoded to be /usr/share/gnome-
shell/theme/ubuntu.css

In the Ubuntu default session, this is the same CSS file as the gnome-
shell mode in /usr/share/gnome-shell/modes/ubuntu.json

However, in other flavors, it makes sense to install another mode json
and theme css file with a clear name. Take, for instance, pop-session,
that installs /usr/share/gnome-shell/theme/pop.css and /usr/share/gnome-
shell/modes/pop.json

In order to supply a custom GDM3 theme, which is currently hardcoded,
the ubuntu.css file must be replaced with this pop.css file. This breaks
ubuntu-session, causing it to have a different shell theme than
expected.

What would be desirable is for the GDM3 CSS file to be hardcoded to
gdm.css, which would be a symlink to the correct stylesheet for the
flavor. This would allow multiple GNOME Shell sessions to be installed
at the same time.

** Affects: gnome-shell
     Importance: Unknown
         Status: Unknown

** Affects: gnome-shell (Ubuntu)
     Importance: Undecided
     Assignee: Jeremy Soller (jackpot51)
         Status: New


** Tags: gnome-17.10 patch
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Allow safe override of GDM3 theme
https://bugs.launchpad.net/bugs/1715722
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