- Start Firefox with
GDK_BACKEND=wayland on Ubuntu 18.10.
- Minimize window and restore it.
- Try to minimize again and switch tabs.
The minimize button, hamburger button and library button stop working, most other buttons still work. Switch tabs and the page content is empty and not being rendered for remote content. Have to maximize/restore window to get everything working again.
Does not happen with system titlebar enabled (CSD disabled) and
mozilla.widget.use-argb-visuals = true/false makes no difference. Reproducible going back to 2018-12-01 build at least so not a recent regression.