Comment 2 for bug 1896334

> I don't understand why yaru-theme needs to be updated, either. I see
> that this has been done for yaru-theme once before, but I've found no
> explanation as to why.

I will make it clearer in the top post, but it should be quite easy to
spot looking at the shell's (data subdir) and yaru diffs:

- Ubuntu's GNOME shell uses a Yaru theme based on upstream
  gnome-shell This theme basically takes the shell's data/ directory,
  applies some diffs and generates a gresource file out of it, that it's
  then loaded on startup (in place of the upstream one).
- GNOME Shell applied some fixes to the theme (se its data/
  directory diffs)
- In order to get those fixes in Ubuntu main session we have to sync
  the upstream changes applied to such dir to yaru's src/gnome-shell
  path
- You can easily compare the diffs applied there to match the ones
  happening in its upstream counterpart.