When opening any window in DLangIDE (including the main window), the Kwin compositing/desktop effects gets disabled, and when quitting the IDE they get reenabled. Also posted here: https://github.com/buggins/dlangide/issues/215
please provide output of xprop and xwininfo of an affected window.
Created attachment 106138 [details] xprop output
Created attachment 106139 [details] xwininfo output
_NET_WM_BYPASS_COMPOSITOR(CARDINAL) = 1 The application asks for it, KWin does. If you don't like you can create a window specific rule to overwrite or use the setting to disallow it in general.