Bug#987931: wiki.debian.org: Wrong env value setting enable qt5 application natively with wayland
On wiki page Wayland#Applications(https://wiki.debian.org/Wayland#Qt_5):
>>>>You are recommended to set the environment variable QT_QPA_PLATFORM to "wayland,xcb" which will have applications perfore...
Set QT_QPA_PLATFORM to "wayland,xcb" has typo error, will break SDDM wayland session login, according to QT Blog(https://www.qt.io/blog/2018/05/29/whats-new-in-qt-5-11-for-the-wayland-platform-plugin), the correct value is "wayland;xcb", seperated by semicolon, not comma.
>>>> In Qt 5.11 we added support for fallback platform plugins, the meas you can now set QT_QPA_PLATFORM="wayland;xcb", which makes Qt use the xcb(X11) plugin if Wayland is not available.