Update Skija backend to allow multiple windows without crashing

[phronmophobic]

No description provided.

[pangloss]

This seems like it's perhaps becoming feasible now that it's possible to use HumbleUI and/or the related JWM project.

[phronmophobic]

I thought the issue was mainly due to the lwjgl glfw wrapper that I use to manage windows for skija, but there might also be a a problem in skija itself, HumbleUI/JWM#107. JWM looks neat, but I'll probably wait for it to settle a bit before trying to integrate it.

Another option is to extract the glfw wrapper that I use for the skia backend and use that.

[phronmophobic]

Oh. Just realized that issue I linked has been closed for a while. I thought it was open because it's still listed as a todo in the readme. Anyway, it looks like there's still some WIP, but it's definitely on my radar!