Having bound `.` to `rationalize_dots` makes typing paths with multiple
`../` segments super easy. This gets cumbersome in some situations
though.
Typing a path like `../.local` is only possible by either typing
`../.<BS><BS>local` (as it is expanded to `../../` on the third dot) or
`..//.local` which is not as annoying but somehow breaks completion on
further path segments.
Bind `Ctrl-.` (i.e. `^N`) to insert a normal dot.