Public bug reported:

The Firefox testing infrastructure is based on Ubuntu 18.04. In order to
enable the Wayland backend by default, we need to also run test on that.

There is one particular bug in Mutter 3.28 that I'd like to see fixed
for that, thus requesting a backport of a patch. It's already in the
upstream repo, but as 3.28 is not supported upstream any more, I request
it here explicitly:
https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1570

@vanvugt @3v1n0 this would be super helpful for us, I hope I can
convince you about that, even if Ubuntu 18.04 doesn't support Wayland
officially.

It can be tested by running Firefox with `MOZ_ENABLE_WAYLAND=1` and
setting `widget.wayland_vsync.enabled:1` in the config (soon to be
enabled by default). If, after launching Firefox again, everything works
as expected - well, then it works.

Bonus: the patch also affects a number of other Wayland applications, so
some users might be happy to see it as well.

** Affects: mutter (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: wayland

** Tags added: wayland

** Description changed:

  The Firefox testing infrastructure is based on Ubuntu 18.04. In order to
- enable the Wayland backend by default, we need to enable it for the
- Wayland backend first.
+ enable the Wayland backend by default, we need to also run test on that.
  
  There is one particular bug in Mutter 3.28 that I'd like to see fixed
  for that, thus requesting a backport of a patch. It's already in the
  upstream repo, but as 3.28 is not supported upstream any more, I request
  it here explicitly:
  https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1570
  
  @vanvugt @3v1n0 this would be super helpful for us, I hope I can
  convince you about that, even if Ubuntu 18.04 doesn't support Wayland
  officially.
  
  It can be tested by running Firefox with `MOZ_ENABLE_WAYLAND=1` and
  setting `widget.wayland_vsync.enabled:1` in the config (soon to be
  enabled by default). If, after launching Firefox again, everything works
  as expected - well, then it works.
  
  Bonus: the patch also affects a number of other Wayland applications, so
  some users might be happy to see it as well.

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https://bugs.launchpad.net/bugs/1905330

Title:
  Backport Wayland frame callback fix for 3.28 for Firefox testing
  infrastructure

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