Hi, we have several places where we have "system" dialogs that don't have a "real" parent window. Examples would be stuff like KWallet, network management, or anything spawned by kded where there's no corresponding app window. Currently, at least on Wayland, they are placed semi-randomly on the screen, which isn't particularly nice. See e.g. https://bugs.kde.org/show_bug.cgi?id=456060. They probably should be centered in the/a screen.
Usually the centering would be achieved by setting a parent window, but in that case there isn't an obvious one. What should we do in that case? Set the parent window to some magic Plasma window? Special-case this in KWin somehow? Something else entirely? Cheers Nico