Embedded CEF in GTK4 renders upside down

[fxzzi]

When using this PR of stremio-linux-shell, which rewrites the program to use GTK4/libadw + embedded CEF, the CEF renders upside down, only on Hyprland.

as shown by this screenshot, the title bar is rendered correctly. In the below screenshot you can also observe that the embedded mpv player is also rendered correctly, whilst the rest of the UI is upside down

I then tried running it on Sway, which worked perfectly. I've attached below the output of running this stremio app with WAYLAND_DEBUG:

debug.txt

If it helps at all, only the visuals of the embedded CEF are flipped vertically. I still have to click at the position the buttons would normally be in.

If you'd like to test this program specifically I've packaged it here: https://gitlab.com/fazzi/nixohess/-/blob/main/parts/pkgs/packages/stremio-linux-shell-rewrite.nix

you're welcome to try it out

[fxzzi]

also looks fine on niri, any more info required?

[EvilLary]

See 1797319 's FIXME.

Setting TRANSFORM to tex->m_transform might fix it. idk I can't test

[fxzzi]

oh ic, thanks for finding. Will wait for someone smarter than me ig to fix lol