allow Ctrl-C to terminate file-finder prompt

[rolandwalker]

This is a special case with its own input handler. It's also a little annoying that C-C appears in the help screen for some cases and not for others.

Incidentally it is difficult to figure out that the search keymap applies to the file-finder rather than the / search.

[jonas]

The search keymap should probably be renamed to edit? I initially introduced it when working on incremental search (#5) and decided to use it for the file finder. An edit keymap makes more sense if we want to repurpose it for things like the y/n prompt etc.

[jonas]

Superb!

[rolandwalker]

I can't think of a single keymap name that would sensibly cover both y/n prompts and file-search.

incremental or filter might be a decent name for what search does now, with some room for the feature to grow into other areas like filtering views by refname.

[jonas]

Maybe"input" could work. Will think about it.