I think wlroots is the standardized thing. Many WMs use it but desktops need to switch over to it afaik. I think KDE talked about doing this for plasma.
I am unsure what wlroots really is and maybe its not a libcompositor you were talking about but similar.
Caught? It was like kinda obvious. You could always locate your Signal folder where everything is downloaded and just see all pictures...
I ignored this flaw as I kept my PC Luks encrypted, but a friend on Windows might not, where everyone with physical access could read everything.
So, yeah. I also dislike the idea that its not encrypted in some sort of way.