SUMMARY When a Dolphin window is started using the --style= argument to override the Qt style, any new window created from it does not inherit the specified style. Instead, the new window reverts to the default Qt style. In other app like Konsole and Kate, the new window do inherit the style of the parent window. STEPS TO REPRODUCE 1. Assume Breeze default Qt style 2. Start Dolphin with dolphin --style=kvantum, a Dolphine window with kvantum Qt style appear 3. Use Ctrl-N or context menu to open a new window OBSERVED RESULT A new Dolphin window appear with the default Breeze style EXPECTED RESULT A new Dolphin window appear with the parent window's style (kvantum) SOFTWARE/OS VERSIONS Linux/KDE Plasma: Fedora 42 KDE Plasma Version: 6.3.4 KDE Frameworks Version: 6.12.0 Qt Version: 6.8.2 ADDITIONAL INFORMATION I'm now using Dolphin in a different Qt style due to a recent change to Breadcrumb. Waiting for https://invent.kde.org/frameworks/kio/-/merge_requests/1842 to be released.
I'm not even able to launch Dolphin with a Qt style passed on command line, with either the installed version or built from git-master. There's no error using a style that exists, it just doesn't work. Dolphin launches using the Global Theme that's set ❯ /usr/bin/dolphin --style=Fusion qt.core.qobject.connect: QObject::connect: No such signal Solid::Backends::Fstab::FstabStorageAccess::checkRequested(QString) qt.core.qobject.connect: QObject::connect: No such signal Solid::Backends::Fstab::FstabStorageAccess::checkDone(Solid::ErrorType, QVariant, QString) qt.core.qobject.connect: QObject::connect: No such signal Solid::Backends::Fstab::FstabStorageAccess::checkRequested(QString) qt.core.qobject.connect: QObject::connect: No such signal Solid::Backends::Fstab::FstabStorageAccess::checkDone(Solid::ErrorType, QVariant, QString) qt.core.qobject.connect: QObject::connect: No such signal Solid::Backends::Fstab::FstabStorageAccess::checkRequested(QString) qt.core.qobject.connect: QObject::connect: No such signal Solid::Backends::Fstab::FstabStorageAccess::checkDone(Solid::ErrorType, QVariant, QString) Hopefully someone else can reproduce this