Show context in un-focused buffers

[NullSense]

Hi, would be great to have an option for the context to persist whenever another buffer is focused.

[romgrk]

Sure. I don't have much time to code these days but I'd accept a PR for it.

[marcelbeumer]

Would also like this feature.

Quickly checked if it would involve changing a line or two, but current code is wired around having always one (reusable) buffer and one window, implementing this will involve keeping track of a buf/win per win.