KDE QT theming doesn't work on Sway

DarkKronicle · November 3, 2024, 10:23pm

I’ve been following qt6ct not detecting installed qt styles · Issue #350514 · NixOS/nixpkgs · GitHub and now pretty much all theming works again after the update to QT 6.8.

Nheko gets correct system colors, Prism Launcher (QT 6.8) looks exactly how it should, same with spotify-qt. The problem is when launching KDE apps (not kirigami ones [I have a workaround for KDE connect that still works]) the theming isn’t working.

Specifically when launching kdePackages.dolphin or kdePackages.okular (probably other ones as well). It seems to kind of respect theme? But color is weirdly wrong, and changing to other colorschemes sometimes fixes it?

I’m wondering if anyone knows what could be going wrong, or if someone has a similar issue.

My config:

github.com

DarkKronicle/nazarick/blob/68299b88487df7bb14795348b6680e1c1f0468b7/modules/home/gui/qt/default.nix

{
  config,
  lib,
  pkgs,
  mypkgs,
  ...
}:
let
  cfg = config.nazarick.gui.qt;

  catpuccinQtct = pkgs.fetchFromGitHub {
    owner = "catppuccin";
    repo = "qt5ct";
    rev = "89ee948e72386b816c7dad72099855fb0d46d41e";
    hash = "sha256-t/uyK0X7qt6qxrScmkTU2TvcVJH97hSQuF0yyvSO/qQ=";
  };
in
{

  options.nazarick.gui.qt = {

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DarkKronicle · November 5, 2024, 3:43pm

Weirdly enough, the theming works for dolphin when using the portal through firefox. This didn’t work before that last patch. Maybe it’s an environment issue?

jilinoleg · November 8, 2024, 3:02am

Do you get an error/warning about qt6ct being built against incompatible qt version if you launch qt apps from command line?

Because I have the same issue and as far as I see it is just the issue of nixos downloading the wrong cached version not meant for nixos unstable. (why?)

Edit: It may not actually be the reason, after poking around in my config, but that error may still be relevant to it, and I do have a very similar issue, even if on another wayland WM.

DarkKronicle · November 8, 2024, 3:03pm

It doesn’t seem so.

When I launch spotify-qt:

›› spotify-qt

kf.windowsystem: Could not find any platform plugin
qt.svg: link #a is undefined!
qt.svg: link #a is undefined!
qt.svg: link #a is undefined!
qt.svg: link #a is undefined!

For dolphin:

›› dolphin

org.kde.dolphin: Unknown class  ""  in session saved data!
qt.dbus.integration: QDBusConnection: name 'org.freedesktop.UDisks2' had owner '' but we thought it was ':1.58'
libKExiv2: Cannot load metadata from file   (Error # %1: The file contains data of an unknown image type )
qt.gui.imageio.jpeg: Not a JPEG file: starts with 0x3c 0x21
qt.gui.imageio.jpeg: Not a JPEG file: starts with 0x3c 0x21

Also I noticed another weird thing, the context menu renders fine.

KDE also released a new frameworks, so maybe that will include a fix. KDE Ships Frameworks 6.8.0 - KDE Community