Qt6 issue on close
When you run kmail in Plasma 6 (started minimized in try) cannot be close after showed. The problem is KMSystemTry::SlotActivcated doesn't call mainWin->show, it doesn't match KMSystemTry::hideKMail calls mainWin->hide. Also all HAVE_X11 guards are completly wrong, X11 is runtime dependacy to be completely removed will take years, every code there should be guarded with KWindowSystem::IsX11, now it generates tons of warnings
kf.windowsystem: KWindowInfo is only functional when running on X11
kf.windowsystem: static void KX11Extras::minimizeWindow(WId) may only be used on X11