Created attachment 119631 [details] applications which follow kvantum vs elisa SUMMARY toolbar appearance (button style, button-radius) and window opacity (with qtcurve and kvantum) isn't affected by the widget style. STEPS TO REPRODUCE 1. change widget style to kvantum(and change the window opacity in the advanced setting(kvantummanager)) or qtcurve 2. open elisa OBSERVED RESULT almost no difference vs breeze EXPECTED RESULT elisa should follow the widget style more closely SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: (available in About System) KDE Plasma Version: KDE Frameworks Version: Qt Version: ADDITIONAL INFORMATION
Thanks for your report
also if it's not possible to change the toolbar appearance to a consistent widget style following look (I really don't know how to do this without removing the overlay toolbar idea, which actually is pretty nice), it might be better not to follow the widget style in the complete cover art area (including the overlay toolbar) and focusing on a clean look, sometimes widget styles (and color-schemes and maybe icons) aren't designed to be only partially followed. But then probably the other part of the application should really use a structure which changes depending on the widget-style (using side-panel appearance for side panel, hide frames if frames are disabled/or show them) and looks more familiar.
I don't think there's anything we can do here. The problem is in Kvantum; its author is a well-known QML hater and he refuses to make Kvantum work better with apps that have a QML-based user interface. You would have to ask him to reconsider his position and support QML apps properly.
I guess the same would apply to qt-curve (and other widget styles)? Afaik most of them are not developed actively anymore