[Bug 1715722] Re: Allow safe override of GDM3 theme

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** Tags added: patch

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https://bugs.launchpad.net/bugs/1715722

Title:
  Allow safe override of GDM3 theme

Status in GNOME Shell:
  Unknown
Status in gnome-shell package in Ubuntu:
  New

Bug description:
  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.

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