I think Daniel was clear by changing to verification-done that this can go in.
We are talking about a less than a second flash, while blocking a bunch of 
fixes for GNOME Shell in cosmic. Note that this second flash already existed 
before the fix, and that the fix is correct, it will only be correctly applied 
once mutter is in.

Daniel, can you please state clearly your intend? Sounds like the GNOME
Shell SRU is now blocked for a month, resulting for instance in still no
checkbox in GDM for accessibility, which is worse than the current issue
we are nitpiking on here IMHO.

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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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