When I click on the editor window or its child windows, it disappears and apparently I click on the window which is behind. It’s very annoying and happens frequently.
I found a warning message in journalctl, I hope it makes sense for somebody:
Jul 10 12:47:57 wrslnx196 gnome-session[2044]: Window manager warning: Buggy client sent a _NET_ACTIVE_WINDOW message with a timestamp of 0 for 0x3a00046 (VicaProjec)
[lots of copies]
VicaProject is the name of my project opened in the editor.
Thanks for the pointer. This may be a problem in SDL, since it is sending _NET_ACTIVE_WINDOW with CurrentTime timestamp. The spec says that the timestamp should match _NET_WM_USER_TIME, but since SDL never sets the latter the situation is unclear (welcome to X11).