Flickering XWayland programs after resume from suspend

[Sébastien Lerique]

Dear all,

I use SDDM and Sway, and since a couple weeks I experience a bug 
where several programs start flickering after I resume from 
suspend, to a point that they are unusable. This happens at least 
on Emacs and Firefox (I admit I haven't tested on IceCat), happens 
in both Sway and Gnome on Wayland, and does not happen in Gnome on 
X11. Which makes me think it is related to XWayland.

On Emacs, some select letters (often 'o') are not rendered. Parts 
of the windows are not refreshed when other parts are updated. 
Logging out (to SDDM) and back in fixes the issue.

Has anyone been experiencing this? I'm not sure how to start 
troubleshooting, or what channels to use to explore this. Any help 
will be much appreciated!

Best,
Sébastien