file-explorer

Quite simple when you know treemacs--get-bounds-of-project exists.

The runner::Runner::run method is quite complicated and deals with a lot of variables.
This can be simplified by consolidating the variables into one or multiple structs.

https://github.com/lambdalisue/fern.vim/blob/master/doc/fern.txt#L650

We don't need to escape <Plug> while it's arguments of :map

Thanks to @thinca

There's no facility to select multiple files for Mac users at the moment. Cmd key isn't mapped and Ctrl+click triggers the option menu.
Needs a mapping change, perhaps.