mcpelauncher-ui-qt fails to load kvantum style

[HurricanePootis]

Hello,

I am using GNOME, and to style my qt5 and qt6 apps, I use the kvantum theme engine with the envar QT_STYLE_OVERRIDE=kvantum. This allows me to have a uniform look across all my apps, as kvantum supports both qt5 and qt6, and has worked with all of my other qt apps so far, like VLC, PrismLauncher, qbittorrent, and OBS. However, whenever I go to run mcpelauncher-ui-qt, I get the following error

QQmlApplicationEngine failed to load component
qrc:/qml/main.qml: module "kvantum" is not installed

If other qt6 applications have no trouble finding kvantum, what is the problem here?

[ChristopherHX]

No idea, the default error log doesn't indicate why qml tries to import kvantum and fails to find it.

QML_IMPORT_TRACE=1 and QT_DEBUG_PLUGINS=1 might tell more about the location of the error.

Does vlc work with qt6 (one of your examples contains qml code)? The archlinux package still has qt5 as the dependency.

Prismlauncher doesn't use qml and therefore cannot return that error.

Does the qt5 version of the gui work with kvantum style? You can try to build via an older aur build script prior the branch swap from ng to qt6. Or manually build minecraft-linux/mcpelauncher-ui-manifest@ng

[Morxemplum]

This issue doesn't just apply to kvantum, I think this applies to nearly EVERY style override.

I have my NixOS configured to override the style of Qt apps to use adwaita. I didn't have this problem when using Qt5 launcher, but I did run into this error with the Qt6 launcher.

QQmlApplicationEngine failed to load component
qrc:/qml/main.qml: module "adwaita" is not installed

Good to see this is not specifically a NixOS issue and is an upstream issue.

Edit: The temporary workaround is to get rid of your style override completely by passing in QT_STYLE_OVERRIDE=""

[ChristopherHX]

temporary workaround

No not temporary, it's long term.

My point of view is your themes have missing qml theme files.

Correct me if I'm wrong, with a qml demo application that uses similar custom qml controls.

What stability claims make qt about QT_STYLE_OVERRIDE?

The voices here fell silent.