Use a proper vendor override for default desktop settings

[locness3]

AFAIK, currently, the custom desktop settings for CelOS are applied in two ways :

• A login script applying some settings on first login
• A gsettings vendor override for some other settings.

These solutions both have their problems :

• The login script is fine but it doesn't feel very professional and is far from being the proper way to this.
• Vendor override is the proper way, but it's still done improperly, as the settings are added to the 10-ubuntu-settings[...] file, which belongs to the upstream ubuntu-settings package, which means it might be overwritten by an update... and it certainly shouldn't be used for downstream settings anyway.

We should make our own vendor override file, with all the desktop settings in it. I have already messed with something like this.

[locness3]

Vendor override is the proper way, but it's still done improperly, as the settings are added to the 10-ubuntu-settings[...] file,

I am referring to this from README:

We have modified the file in "/usr/share/glib-2.0/schemas/10-ubuntu-settings.gschema.override" in order for our Adwaita Icons, Wallpaper, and Adwaita-dark shell theme to apply by default.

[locness3]

Have a look at this article for making a vendor override file. Settings relevant here should be found within /org/gnome in dconf-editor.

[TheOceanBreeze]

See this article for information about Ubuntu adding color options to Gnome: https://ubuntuhandbook.org/index.php/2022/03/gnome-42-released-ubuntu-2204-desktop/

[locness3]

This article does not really give any useful technical information. It would however be good to consider how we can make our theme choice and these new theme settings work together.

As far as I can recall the different accent colors are just global GTK stylesheets.

Things to research :

• I thought that there wouldn't be GTK4 apps in this version of Ubuntu, however that's not what this article is saying. Although whether or not Ubuntu is including some, we inevitably will, through Flatpak. I wonder what the accent color setting would do with GTK4+libadwaita apps (which do not follow the system theme) and especially Flatpaked ones.
• How is the light/dark theme selector implemented? Does it choose between two global GTK stylesheets (and are these forcibly Yaru?), does it use the new Dark Style Preference , or does it do both?
• How is this all stored and accessible in dconf?
• Do these settings show up only on Ubuntu's downstream GNOME session, like the settings for the Dock do in 20.04, or do they show on the vanilla GNOME session (which we're using) as well? If they don't, all of the above problems are mostly solved.