[Merge] ~3v1n0/ubuntu/+source/gnome-session:ubuntu/master-migrate-settings-to-yaru into ~ubuntu-desktop/ubuntu/+source/gnome-session:ubuntu/master

[Marco Trevisan (Treviño)]

Marco Trevisan (Treviño) has proposed merging ~3v1n0/ubuntu/+source/gnome-session:ubuntu/master-migrate-settings-to-yaru into ~ubuntu-desktop/ubuntu/+source/gnome-session:ubuntu/master.

Requested reviews:
  Marco Trevisan (Treviño) (3v1n0)
  Ubuntu Desktop (ubuntu-desktop)

For more details, see:
https://code.launchpad.net/~3v1n0/ubuntu/+source/gnome-session/+git/gnome-session/+merge/354136

Ensre we migrate Yaru relevant settings to defaults if the user values matches the old defaults.

However... This should actually only run when the ubuntu-session is running, or might change the settings to someone running the classic gnome-session but with the old ubuntu settings.

session migrations doesn't seem to help much on this, but there could be some strategies:

1) Return an error if the migration script runs in a session it doesn't care about
  1a) change session-migrations to support a specific exit-code as "skip this" without triggering any error (or gprinterr)
2) Add this script to an XDG_DATA_DIR that is only specific for the ubuntu-session (needs more changes and is ugly)

So... Let me know what you prefer.
-- 
Your team Ubuntu Desktop is requested to review the proposed merge of ~3v1n0/ubuntu/+source/gnome-session:ubuntu/master-migrate-settings-to-yaru into ~ubuntu-desktop/ubuntu/+source/gnome-session:ubuntu/master.
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