The methods to get window classes described in the README don't work for some windows, such as all context menus (they disappear immediately when using the qdbus method), Spectacle's Wayland recording window and probably some more.
I thought about just logging some information whenever a window is added, but that would require users to launch KWin in a terminal, which is not very convenient. Another approach would be to display some information about the last n added windows in a table in the options.
The methods to get window classes described in the README don't work for some windows, such as all context menus (they disappear immediately when using the qdbus method), Spectacle's Wayland recording window and probably some more.