In Ubuntu 19.04, the wrong background (a gradient) flashes up briefly during the login animation

[Daniel van Vugt]

https://trello.com/c/dfrK5l8Q

In Ubuntu 19.04, the wrong background (a gradient) flashes up briefly during the login animation.

This has been separated from the 18.10 problem in bug 1789356 to avoid confusion. They have slightly different themes and require different fixes.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: gnome-shell 3.30.2-1ubuntu1
ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
Uname: Linux 4.18.0-11-generic x86_64
ApportVersion: 2.20.10-0ubuntu19
Architecture: amd64
Date: Thu Jan 24 15:15:33 2019
DisplayManager: gdm3
GsettingsChanges:
 b'org.gnome.shell' b'command-history' redacted by apport
 b'org.gnome.shell' b'had-bluetooth-devices-setup' b'true'
 b'org.gnome.shell' b'app-picker-view' b'uint32 1'
 b'org.gnome.shell' b'favorite-apps' redacted by apport
 b'org.gnome.desktop.interface' b'gtk-im-module' b"'gtk-im-context-simple'"
InstallationDate: Installed on 2018-12-04 (51 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Alpha amd64 (20181203)
SourcePackage: gnome-shell
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel van Vugt (vanvugt)]

Here's a quick fix to replace background_login.patch.

Although now that I look more closely, I think next week I might attempt a proper upstream fix so that gnome-shell always uses the same style for both the login screen and the system background. They both live in the same project so it should be possible. That would also eliminate the need for either background_login.patch or this new one.

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "0001-js-ui-background.js-Use-Ubuntu-purple-to-match-login.patch" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

[Daniel van Vugt (vanvugt)]

Finally got there. Although ran out of time to think about a general redesign that could be upstreamed. Instead I've just proposed a fix specific to disco:

https://code.launchpad.net/~vanvugt/ubuntu/+source/gnome-shell/+git/gnome-shell/+merge/363831

[Daniel van Vugt (vanvugt)]

https://git.launchpad.net/~ubuntu-desktop/ubuntu/+source/gnome-shell/commit/?id=c14508e8bffd496e568dbf9c97b547fccbb4cea6

[Iain Lane (laney)]

(Fixed in git, going to be uploaded soon, no need to rls track)

[Launchpad Janitor (janitor)]

This bug was fixed in the package gnome-shell - 3.31.92-1ubuntu1

---------------
gnome-shell (3.31.92-1ubuntu1) disco; urgency=medium

  [ Daniel van Vugt ]
  * Update ubuntu/background_login.patch to match the new login screen
    (system background) design from Yaru for a smooth login animation
    (LP: #1813119).

  [ Iain Lane ]
  * Merge with debian, remaining changes:
    + Replace gnome-backgrounds dep with ubuntu-wallpapers and Suggests
      gnome-themes-standard-data, gnome-backgrounds
    + Add some Recommends:
      - ubuntu-session (| gnome-session) to have the ubuntu session available
      - xserver-xorg-legacy
      - yaru-theme-gnome-shell for the default ubuntu theming
    + Update debian/gbp.conf with Ubuntu settings
    + gnome-shell-common.install: Install Ubuntu mode
    + gnome-shell-common.prerm: Remove deprecated ubuntu theme alternative
    + ubuntu/desktop_detect.patch:
      - add caching for desktop detection to avoid querying the current
        desktop env variable as iterate through the list each time. For the
        time of the Shell process, we can expect this env variable to stay
        stable.
    + ubuntu/smarter_alt_tab.patch:
      - quick alt-tab (without showing up the switcher) switch only between
        the last window of the last 2 applications to be focused instead of
        raising all windows of those apps.
    + ubuntu/lightdm-user-switching.patch:
      - Allow user switching when using LightDM.
    + ubuntu/lock_on_suspend.patch
      - Respect Ubuntu's lock-on-suspend setting.
    + ubuntu/gdm.patch
      - as gdm is system-wide and not session-wide, ensure gdm has an ubuntu
        styling by default, not impacting the gnome user session though.
    + ubuntu/background_login.patch
      - Change default background color as we modified the default GDM color
        for our ubuntu session. Change it as well here, still applying the
        background noise loading.
    + ubuntu/gdm_alternatives.patch
      - Add support for GDM3 theme alternatives
    + ubuntu/block_mode_extension_update.patch
      - Don't allow ubuntu mode extension to update
    + optional-hot-corner.patch
      - enable patch proposed by upstream developer already in package (but
        not in series) to add a settings for optional hot corner activation.
    + volume-Add-back-sound-feedback-on-scroll.patch
      - Fix regression causing missing feedback on volume slider scroll
    + main-show-an-error-message-on-gnome-shell-crash.patch,
      global-make-possible-to-set-debug-flags-dynamically.patch,
      main-increase-the-granularity-of-backtraces-in-SHELL_DEBU.patch,
      main-add-backtrace-crashes-all-and-backtrace-all.patch,
      sessionMode-add-support-for-debugFlags-parameter.patch:
      - Improve debug JS tracing for crash reports
    + st-scroll-view-Handle-the-case-where-scrollbars-are-NULL.patch,
      st-scroll-view-Remove-scrollbars-references-on-dispose.patch:
      - Fix crash on theme changes
    + ubuntu/search-call-XUbuntuCancel-method-on-providers-when-no-dat.patch:
      - stop searches when requested from UI
    + debian/patches/ubuntu/background_login.patch:
      - match Yaru theme in the ub...