"Unknown" windows shown in application switcher [EDIT -> Kile has no icon in App-swicher or Dash]
For some apps, cf. the screenshot, additionally "unknown" windows, seemingly attached to kile and firefox, are shown in the application switcher -> Alt+Tab.
[Edit -> there is only one unknown window, the other icon less one in the application switcher is not unknown, but attached to kile. The unknown window is not reproducible]
Ubuntu 18.10, wayland, gnome session.
How can I add additional info?
Precision : Kile simply seems to not provide an icon, while the additional unknown window is attached to totem=Videos.
Edited by Sebastian Keller