The spinner animation in the panel has hiccups and jumps periodically

Status changed to 'Confirmed' because the bug affects multiple users.

Ubuntu 22.04 development branch @ 17/03/2022

When launching firefox snap, and keep the mouse cursor over the dock or top panel
the spinner animation takes 5sec loading, but i dont see hiccups, feels rather stable on my side

Maybe it's specific to high-DPI? I'm using scale 200%

I can confirm the problem on my 22.04 VM.
I've got a 1080p screen and I don't use scaling.

But is the problem also present using the default GS theme + Yaru icons or Yaru GS theme + Adwaita icons or both default theme and icons?

The problem is that my VM crashed and I can't start it, so I can't test this at once.
I'm downloading the latest ISO, but it would be nice if anyone could test this.

I found the problem: one image of the animation is misaligned.

I made a patch: https://github.com/ubuntu/yaru/pull/3519

This bug was fixed in the package yaru-theme - 22.04.3.1

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yaru-theme (22.04.3.1) jammy; urgency=medium

  [ Marco Trevisan (Treviño) ]
  * gtk: Do not use shell scss sources to define accent colors used by icons
  * github: Generate rendered icons and symlinks automatically
  * icons: Use more predicibile rendering target names
  * meson: Render each icon separately to use multi-process rendering
  * render-bitmaps: Fail in case no SVG is rendered
  * meson: Allow to render one icon across all the flavours separately
  * render-bitmaps: Support searching for icons by category
  * github: Add automated workflow to optimize SVG
  * github: Do a full icons rebuild if the renderer script changes
  * icons/generate-symlinks.sh: Ignore empty lines on list file
  * icons/phosh.list: Remove trailing empty line
  * CI: Split build workflow in multiple steps
  * icons: Add tests to try generating symlinks
  * meson: Use more fs filename modifications functions
  * Revert "icons: modify meson and deb files (LP: #1965649)
  * github: Fix Links on generated PRs
  * meson: Bump dependency to 0.59 as per fs.parent() usage
  * icons: Install panel icons only if mate or unity are enabled
  * icons: Ensure symlinks are all generated from symlink script
  * icons/scalable: Remove icons that are already handled via symlinks
  * icons: Remove all the links in source dirs, they should be handled via lists
  * CI: Recreate symlinks removing old ones
  * CI: Detect changes on all symlinks files
  * CI: Ensure that no symlinks are used in icon sources
  * CI: Use inverse logic, we don't want symlinks :)
  * CI: Cleanup rendered icons before render them again
  * icons/accented: Remove software store from accented icons
  * gnome-shell: Use correct syntax for or'ed find
  * CI: Archive meson logs
  * generate-index-theme: Support excluding a specific icons directory
  * icons: Also generate symlinks for 22x22 icons
  * icons: Generate panel symlinks, and install them only when needed
  * generate-index-theme: Handle the scalable min/max size cases
  * generate-index-theme: Use proper context names when not computable
  * icons: Auto-generate index.theme for default and mate icon themes
  * generate-index-theme: Support excluding elements by context
  * generate-index-theme: Support providing custom parameters for a folder
  * icons: Replicate symlinks in installed folder when using meson >= 0.61
  * icons: Use nicer way to compute find command for excluded folders
  * gnome-shell: Use native meson symlink installer when possible
  * icons, gnome-shell: Use python-computed relative paths
  * CI: Make meson options more readable in full build
  * gnome-shell: Add further option to toggle UserThemes support
  * debian/rules: Enable user themes support in packages
  * icons: Add more accented icons
  * icons: Use better name for rendered icon target
  * gtk, gnome-shell: Only generate Yaru-$accent-dark themes if `dark` is set
  * icons: Generate dark variants of the icons theme
  * CI: Also consider untracked changes on rendering/optimizing icons
  * CI: Use proper syntax to check on rendered icons changes
  * icons: Install icons symlinks as such also wit...