Possible new feature: use the top-right corner for state information

[Marco Diego Aurélio Mesquita]

Hi Benno!

I'd like to implement this: https://savannah.gnu.org/bugs/?57953

Any objection?

Also, now that we finally anchors, I was thinking about some new uses for it:
 * Toggling search/linter results to anchors
    These would allow us to make other searchs without losing previous
search or linter results. This is very useful when I want clear all
warnings/errors from a file.

What do you think of those?