KDE Plasma support for Qt::WindowStaysOnTopHint flag in Wayland

[Duha]

The information I could find so far:
https://bugreports.qt.io/browse/QTBUG-73456

Custom Desktop Panel Placement in KWin with Wayland

xdg-shell is the protocol used for “regular” application windows. Despite having “shell” in the name it is not suitable for developing Shell/Desktop environment components as in plasmashell. For example it (by design) doesn’t allow windows to position themselves, which is why the Qt API for it doesn’t work on Wayland. For developing things like panels you need a different protocol that allows to do things regular application windows can’t do. The de-facto standard for this is the layer-shell pr…

@nicolasfella

While Qt by default uses xdg-shell for its windows you can make it use layer-shell using layer-shell-qt

Maybe this works for you.