Desktop icons vanishing when in Activities Overview is jarring and looks ugly

Fix proposed: https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1070

If we need to patch it then the patch is here:

https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1070.patch

Though let me know if that needs refreshing.

This bug was fixed in the package gnome-shell - 3.36.0-2ubuntu1

---------------
gnome-shell (3.36.0-2ubuntu1) focal; urgency=medium

  * Merge with Debian. Ubuntu bugs resolved since 3.35.91-1ubuntu2:
    - gnome-shell crashed when enable-animations was false (LP: #1866044)
    - Overview animations were not reliably smooth (LP: #1725180)
    - Higher than necessary CPU usage on mouse movement (LP: #1848951)
    - Extension's preferences did not load (LP: #1866146)
  * debian/control:
    - Breaks yaru (<< 20.04.3~)
    - Breaks gnome-session (<< 3.35.3-1ubuntu4~) as per gdm yaru gresources
    - Breaks gnome-shell-extension-ubuntu-dock (<< 67ubuntu20.04.3)
    - Update Vcs-* to point to salsa ubuntu branches
  * ubuntu.json: Use Yaru gresource file for theming in ubuntu mode
  * debian/patches: Refresh
  * d/p/overview-Fade-in-out-over-the-desktop-instead-of-replacin.patch:
    - Fade in/out the desktop instead of replacing it (LP: #1847712)
  * d/p/ubuntu/gdm_alternatives.patch:
    - Set the default theme resource for gdm session to 'gdm3-theme.gresource'
    - Alias the default gnome-shell.css to gdm3.css
  * gnome-shell-common.install: Don't install compiled css file anymore
  * gnome-shell-common.{preinst,prerm}:
    - Remove obsolete alternative gdm3.css symlink
  * gnome-shell-common.postinst:
    - Set gnome-shell-theme.gresource as alternative for gdm3-theme.gresource
  * Remaining changes from debian:
    + 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.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/background_login.patch
      - Change default background color as we modified the default GDM color
        for our ubuntu session.
    + ubuntu/gdm_alternatives.patch
      - Add support for GDM3 theme alternatives
    + 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.
    + 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-c...

We should probably revert this because it needs refreshing to fix serious bugs:

https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1070#note_749121

and after that it's exposed some kind of new bug in mutter:

https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1070#note_749229

Tagging rls-ff-notfixing, the patch had issue and it was agreed to remove that fix from the focal list now

Fully fixed again and awaiting review:
https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1070

New fix proposed in:
https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1395

For patching into Ubuntu I think we should still use:

  https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1395.patch

It's only closed upstream because they want a different design. But that will not be as simple and reliable as the above patch, which should also be backportable.

Minor progress: desktop-icons-ng emulates a traditional Xorg desktop window so is able to convince gnome-shell to fade the icons in/out properly. But only in Xorg sessions.

In jammy, the desktop-icons-ng extension now does the hiding/showing of the icons (https://gitlab.com/rastersoft/desktop-icons-ng/-/commit/6ab838e832b3771)

It's been a few years now and we still haven't landed a fix. I would like to attempt a fix specifically in desktop-icons-ng in future, but either way this bug can drop severity...

The logic that made this bug relevant to gnome-shell has been deleted in 42.0:
https://gitlab.gnome.org/GNOME/gnome-shell/-/commit/2127222b39c