[Bug]: Flatpaks don't respect gtk theme, cursor size and text antializing doesn't work.

[userom11]

Checklist

• [X] I agree to follow the Code of Conduct that this project adheres to.
• [X] I have searched the issue tracker for a bug that matches the one I want to file, without success.
• [X] If this is an issue with a particular app, I have tried filing it in the appropriate issue tracker for the app (e.g. under https://github.com/flathub/) and determined that it is an issue with Flatpak itself.
• [X] This issue is not a report of a security vulnerability (see here if you need to report a security issue).

Flatpak version

1.15.4

What Linux distribution are you using?

Fedora Linux

Linux distribution version

38

What architecture are you using?

x86_64

How to reproduce

1.I have given flatpaks permission to usr/share/themes and set environment var to GTK_THEME=Adwaita-dark, however it doesn't work/ 2.The cursor and text antialising glich happend after a chrome update

Expected Behavior

I expect adwaita dark theme and cursor size and antialising to be correct

Actual Behavior

Flatpaks use wrong gkt theme, cursor size is wrong, and text is pixelated.

Additional Information

sway

[Hyperspeed1313]

Per the documentation, access to the /usr folder is blacklisted.

Even if manually specified, exposing that folder to a Flatpak application is not intended to be possible.

[Sinaaaa]

Per the documentation, access to the /usr folder is blacklisted.

Even if manually specified, exposing that folder to a Flatpak application is not intended to be possible.

Moving the themes to the correct userdir & then giving permission to the app fixes the cursor theme problem, but cursor size reverting the default happens to me on and off since I started using flatpaks a year ago, sigh.

[chrisawi]

Don't set GTK_THEME. Libadwaita apps cannot be themed in the conventional way, but they will respect dark mode via the settings portal. You need to install a portal backend that supports the color-scheme setting, e.g. xdg-desktop-portal-gtk, and then enable dark mode in the manner appropriate for that backend (for x-d-p-gtk, it would be the GNOME setthing).

To quote myself from another issue:

The non-antialiased text issue is the same as #2861, and that has been fixed in GTK. [...] Other desktop integration issues like cursor theme and window controls can currently only be resolved by installing xdg-desktop-portal-gtk and configuring the relevant GNOME settings with gsettings. There is no standardization between toolkits on Wayland for most settings like that.