qt6gtk2 doesn't work with Qt 6.6

[guiodic]

On Arch with QT 6.6, qt6gtk2 doesnt work and QT falls back to "windows 95" theme.

[trialuser02]

Try to recompile it.

[guiodic]

That was the first thing I did, but it didn't work.

[guiodic]

`$ QT_QPA_PLATFORMTHEME=gtk2 QT_DEBUG_PLUGINS=1 QT_LOGGING_RULES=plugins=true qt6ct

qt.core.plugin.factoryloader: checking directory path "/usr/lib/qt6/plugins/platforms" ... qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/platforms/libqeglfs.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/platforms/libqeglfs.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "eglfs" ] }, "archlevel": 1, "className": "QEglFSIntegrationPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("eglfs") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/platforms/libqlinuxfb.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/platforms/libqlinuxfb.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "linuxfb" ] }, "archlevel": 1, "className": "QLinuxFbIntegrationPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("linuxfb") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/platforms/libqminimal.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/platforms/libqminimal.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "minimal" ] }, "archlevel": 1, "className": "QMinimalIntegrationPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("minimal") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/platforms/libqminimalegl.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/platforms/libqminimalegl.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "minimalegl" ] }, "archlevel": 1, "className": "QMinimalEglIntegrationPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("minimalegl") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/platforms/libqoffscreen.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/platforms/libqoffscreen.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "offscreen" ] }, "archlevel": 1, "className": "QOffscreenIntegrationPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("offscreen") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/platforms/libqvkkhrdisplay.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/platforms/libqvkkhrdisplay.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "vkkhrdisplay" ] }, "archlevel": 1, "className": "QVkKhrDisplayIntegrationPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("vkkhrdisplay") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/platforms/libqvnc.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/platforms/libqvnc.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "vnc" ] }, "archlevel": 1, "className": "QVncIntegrationPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("vnc") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/platforms/libqxcb.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/platforms/libqxcb.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformIntegrationFactoryInterface.5.3", "MetaData": { "Keys": [ "xcb" ] }, "archlevel": 1, "className": "QXcbIntegrationPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("xcb") qt.core.plugin.factoryloader: checking directory path "/usr/bin/platforms" ... qt.core.library: "/usr/lib/qt6/plugins/platforms/libqxcb.so" loaded library qt.core.plugin.factoryloader: checking directory path "/usr/lib/qt6/plugins/platformthemes" ... qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/platformthemes/libqgtk3.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/platformthemes/libqgtk3.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformThemeFactoryInterface.5.1", "MetaData": { "Keys": [ "gtk3" ] }, "archlevel": 1, "className": "QGtk3ThemePlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("gtk3") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/platformthemes/libqxdgdesktopportal.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/platformthemes/libqxdgdesktopportal.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformThemeFactoryInterface.5.1", "MetaData": { "Keys": [ "xdgdesktopportal", "flatpak", "snap" ] }, "archlevel": 1, "className": "QXdgDesktopPortalThemePlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("xdgdesktopportal", "flatpak", "snap") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/platformthemes/libqt6ct.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/platformthemes/libqt6ct.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformThemeFactoryInterface.5.1", "MetaData": { "Keys": [ "qt6ct", "qt5ct" ] }, "archlevel": 1, "className": "Qt6CTPlatformThemePlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("qt6ct", "qt5ct") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/platformthemes/libqt6gtk2.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/platformthemes/libqt6gtk2.so, metadata= { "IID": "org.qt-project.Qt.QPA.QPlatformThemeFactoryInterface.5.1", "MetaData": { "Keys": [ "gtk2", "qt6gtk2", "qt5gtk2" ] }, "archlevel": 1, "className": "Qt6Gtk2ThemePlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("gtk2", "qt6gtk2", "qt5gtk2") qt.core.plugin.factoryloader: checking directory path "/usr/bin/platformthemes" ... qt.core.library: "/usr/lib/qt6/plugins/platformthemes/libqt6gtk2.so" loaded library qt.core.plugin.factoryloader: checking directory path "/usr/lib/qt6/plugins/platforminputcontexts" ... qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so, metadata= { "IID": "org.qt-project.Qt.QPlatformInputContextFactoryInterface.5.1", "MetaData": { "Keys": [ "compose", "xim" ] }, "archlevel": 1, "className": "QComposePlatformInputContextPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("compose", "xim") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/platforminputcontexts/libibusplatforminputcontextplugin.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/platforminputcontexts/libibusplatforminputcontextplugin.so, metadata= { "IID": "org.qt-project.Qt.QPlatformInputContextFactoryInterface.5.1", "MetaData": { "Keys": [ "ibus" ] }, "archlevel": 1, "className": "QIbusPlatformInputContextPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("ibus") qt.core.plugin.factoryloader: checking directory path "/usr/bin/platforminputcontexts" ... qt.core.library: "/usr/lib/qt6/plugins/platforminputcontexts/libcomposeplatforminputcontextplugin.so" loaded library qt.core.plugin.factoryloader: checking directory path "/usr/lib/qt6/plugins/styles" ... qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/styles/libqt6ct-style.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/styles/libqt6ct-style.so, metadata= { "IID": "org.qt-project.Qt.QStyleFactoryInterface", "MetaData": { "Keys": [ "qt6ct-style", "qt5ct-style" ] }, "archlevel": 1, "className": "Qt6CTStylePlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("qt6ct-style", "qt5ct-style") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/styles/libqt6gtk2-style.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/styles/libqt6gtk2-style.so, metadata= { "IID": "org.qt-project.Qt.QStyleFactoryInterface", "MetaData": { "Keys": [ "gtk2", "qt6gtk2", "qt5gtk2" ] }, "archlevel": 1, "className": "Qt6Gtk2StylePlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("gtk2", "qt6gtk2", "qt5gtk2") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/styles/oodwaita.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/styles/oodwaita.so, metadata= { "IID": "org.qt-project.Qt.QStyleFactoryInterface", "MetaData": { "Keys": [ "Oomox" ] }, "archlevel": 1, "className": "StylePlugin", "debug": false, "version": 394496 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("oomox") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/styles/breeze6.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/styles/breeze6.so, metadata= { "IID": "org.qt-project.Qt.QStyleFactoryInterface", "MetaData": { "Keys": [ "Breeze" ] }, "archlevel": 1, "className": "StylePlugin", "debug": false, "version": 394496 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("breeze") qt.core.plugin.factoryloader: checking directory path "/usr/bin/styles" ... qt.core.library: "/usr/lib/qt6/plugins/styles/libqt6gtk2-style.so" loaded library QGuiApplication::setDesktopFileName: the specified desktop file name ends with .desktop. For compatibility reasons, the .desktop suffix will be removed. Please specify a desktop file name without .desktop suffix Configuration path: "/home/guido/.config/qt6ct" Shared QSS paths: QList("/home/guido/.local/share/qt6ct/qss", "/usr/local/share/qt6ct/qss", "/usr/share/qt6ct/qss") Shared color scheme paths: QList("/home/guido/.local/share/qt6ct/colors", "/usr/local/share/qt6ct/colors", "/usr/share/qt6ct/colors") qt.core.plugin.factoryloader: checking directory path "/usr/lib/qt6/plugins/iconengines" ... qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/iconengines/libqsvgicon.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/iconengines/libqsvgicon.so, metadata= { "IID": "org.qt-project.Qt.QIconEngineFactoryInterface", "MetaData": { "Keys": [ "svg", "svgz", "svg.gz" ] }, "archlevel": 1, "className": "QSvgIconPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("svg", "svgz", "svg.gz") qt.core.plugin.factoryloader: checking directory path "/usr/bin/iconengines" ... qt.core.plugin.factoryloader: checking directory path "/usr/lib/qt6/plugins/imageformats" ... qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/imageformats/libqgif.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/imageformats/libqgif.so, metadata= { "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface", "MetaData": { "Keys": [ "gif" ], "MimeTypes": [ "image/gif" ] }, "archlevel": 1, "className": "QGifPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("gif") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/imageformats/libqico.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/imageformats/libqico.so, metadata= { "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface", "MetaData": { "Keys": [ "ico", "cur" ], "MimeTypes": [ "image/vnd.microsoft.icon", "image/vnd.microsoft.icon" ] }, "archlevel": 1, "className": "QICOPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("ico", "cur") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/imageformats/libqjpeg.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/imageformats/libqjpeg.so, metadata= { "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface", "MetaData": { "Keys": [ "jpg", "jpeg" ], "MimeTypes": [ "image/jpeg", "image/jpeg" ] }, "archlevel": 1, "className": "QJpegPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("jpg", "jpeg") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/imageformats/libqsvg.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/imageformats/libqsvg.so, metadata= { "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface", "MetaData": { "Keys": [ "svg", "svgz" ], "MimeTypes": [ "image/svg+xml", "image/svg+xml-compressed" ] }, "archlevel": 1, "className": "QSvgPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("svg", "svgz") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/imageformats/libqicns.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/imageformats/libqicns.so, metadata= { "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface", "MetaData": { "Keys": [ "icns" ], "MimeTypes": [ "image/x-icns" ] }, "archlevel": 1, "className": "QICNSPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("icns") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/imageformats/libqjp2.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/imageformats/libqjp2.so, metadata= { "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface", "MetaData": { "Keys": [ "jp2" ], "MimeTypes": [ "image/jp2", "image/jpx", "image/jpm", "video/mj2" ] }, "archlevel": 1, "className": "QJp2Plugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("jp2") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/imageformats/libqmng.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/imageformats/libqmng.so, metadata= { "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface", "MetaData": { "Keys": [ "mng" ], "MimeTypes": [ "image/x-mng" ] }, "archlevel": 1, "className": "QMngPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("mng") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/imageformats/libqtga.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/imageformats/libqtga.so, metadata= { "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface", "MetaData": { "Keys": [ "tga" ], "MimeTypes": [ "image/x-tga" ] }, "archlevel": 1, "className": "QTgaPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("tga") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/imageformats/libqtiff.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/imageformats/libqtiff.so, metadata= { "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface", "MetaData": { "Keys": [ "tiff", "tif" ], "MimeTypes": [ "image/tiff", "image/tiff" ] }, "archlevel": 1, "className": "QTiffPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("tiff", "tif") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/imageformats/libqwbmp.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/imageformats/libqwbmp.so, metadata= { "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface", "MetaData": { "Keys": [ "wbmp" ], "MimeTypes": [ "image/vnd.wap.wbmp" ] }, "archlevel": 1, "className": "QWbmpPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("wbmp") qt.core.plugin.factoryloader: looking at "/usr/lib/qt6/plugins/imageformats/libqwebp.so" qt.core.plugin.loader: Found metadata in lib /usr/lib/qt6/plugins/imageformats/libqwebp.so, metadata= { "IID": "org.qt-project.Qt.QImageIOHandlerFactoryInterface", "MetaData": { "Keys": [ "webp" ], "MimeTypes": [ "image/webp" ] }, "archlevel": 1, "className": "QWebpPlugin", "debug": false, "version": 394752 }

qt.core.plugin.factoryloader: Got keys from plugin meta data QList("webp") qt.core.plugin.factoryloader: checking directory path "/usr/bin/imageformats" ... qt.core.library: "/usr/lib/qt6/plugins/imageformats/libqgif.so" loaded library qt.core.library: "/usr/lib/qt6/plugins/imageformats/libqico.so" loaded library qt.core.library: "/usr/lib/qt6/plugins/imageformats/libqjpeg.so" loaded library qt.core.library: "/usr/lib/qt6/plugins/imageformats/libqsvg.so" loaded library qt.core.library: "/usr/lib/qt6/plugins/imageformats/libqicns.so" loaded library qt.core.library: "/usr/lib/qt6/plugins/imageformats/libqjp2.so" loaded library qt.core.library: "/usr/lib/qt6/plugins/imageformats/libqmng.so" loaded library qt.core.library: "/usr/lib/qt6/plugins/imageformats/libqtga.so" loaded library qt.core.library: "/usr/lib/qt6/plugins/imageformats/libqtiff.so" loaded library qt.core.library: "/usr/lib/qt6/plugins/imageformats/libqwbmp.so" loaded library qt.core.library: "/usr/lib/qt6/plugins/imageformats/libqwebp.so" loaded library qt.core.library: "/usr/lib/qt6/plugins/iconengines/libqsvgicon.so" loaded library qt.core.plugin.factoryloader: checking directory path "/usr/lib/qt6/plugins/accessible" ... qt.core.plugin.factoryloader: checking directory path "/usr/bin/accessible" ... qt.core.plugin.factoryloader: checking directory path "/usr/lib/qt6/plugins/accessiblebridge" ... qt.core.plugin.factoryloader: checking directory path "/usr/bin/accessiblebridge" ...`

[trialuser02]

QT_STYLE_OVERRIDE?

[guiodic]

QT_QPA_PLATFORMTHEME=gtk2 QT_STYLE_OVERRIDE=gtk2 qt6ct

and

QT_QPA_PLATFORMTHEME=gtk2 QT_STYLE_OVERRIDE="" qt6ct

same result...

[trialuser02]

Try to start /usr/lib/qt6/bin/assistant instead of qt6ct.

[guiodic]

Same result. Happens with all Qt6 apps, not a qt6ct problem.

[guiodic]

OK, this happened. I opened GIMP and it was giving me the same problem, from which I realised it was related to gtk2, not qt6gtk2. I changed the theme in kde's gtk settings, then put the "breeze" theme back and now it works. thanks!