The proposed version of gnome-shell only makes this bug a little worse,
to the extent that I expect other people will start reporting the bug
and not just me. I don't mind if the gnome-shell fix goes into cosmic
first and we live with that briefly - it would be no worse than disco is
right now. However if the mutter fix was to be released first then we
would avoid a perceived secondary (more visible) regression.

That all said, I agree with Didier that if other bug fixes are getting
delayed by this then just release it. The proposed gnome-shell version
does not need fixing in itself. It only needs an additional mutter fix
later to correct the login animation appearance.

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https://bugs.launchpad.net/bugs/1789356

Title:
  The wrong background flashes up briefly during the login animation
  since Yaru was introduced

Status in gnome-shell package in Ubuntu:
  Fix Released
Status in mutter package in Ubuntu:
  In Progress
Status in gnome-shell source package in Cosmic:
  Incomplete
Status in mutter source package in Cosmic:
  Triaged

Bug description:
  [Impact]

  The wrong background flashes up briefly (for a split second) during the login 
animation.
  The login screen and gnome-shell's system background are meant to be the same 
image so that the login procedure can VT switch without the user noticing. Then 
the final desktop expands over the system background. However it appears the 
login background and system background are not the same image any more, causing 
a visible glitch during login.

  [Test Case]

  1. Install new version, logout
  2. Log in into GDM
  -> Check that at login startup, the background matches GDM ones (same color, 
same gradient)
  3. Logout, install gnome-session
  4. Reboot so that GDM takes gnome-session into account
  5. Select GNOME session and login
  -> At login startup, the background will matche the GNOME default one (from 
the lockscreen: grey noise), which matches GDM one if reset to default GNOME 
via update-alternatives.

  [Regression Potential]

  This code is loaded at session startup, if there is a syntax error, the 
session wouldn't start at all.
  This has been of course tested before committed (both on ubuntu and GNOME 
sessions)

  ProblemType: Bug
  DistroRelease: Ubuntu 18.10
  Package: yaru-theme-gnome-shell 18.10.2
  ProcVersionSignature: Ubuntu 4.17.0-7.8-generic 4.17.12
  Uname: Linux 4.17.0-7-generic x86_64
  ApportVersion: 2.20.10-0ubuntu9
  Architecture: amd64
  Date: Tue Aug 28 14:19:48 2018
  Dependencies:

  InstallationDate: Installed on 2018-05-26 (93 days ago)
  InstallationMedia: Ubuntu 18.10 "Cosmic Cuttlefish" - Alpha amd64 (20180525)
  PackageArchitecture: all
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  SourcePackage: yaru-theme
  UpgradeStatus: No upgrade log present (probably fresh install)

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