zsh:keys: Add normal . behaviour on Ctrl-.

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.

.config/zsh/zshrc.d/60-keys.zsh

@@ -100,6 +100,11 @@ function rationalize_dots {
 zle -N rationalize_dots
 bindkey . rationalize_dots
 
+# Keep the normal dot self-insert on Ctrl-. (e.g. for typing `../.local`)
+function default_dot { LBUFFER+=. }
+zle -N default_dot
+bindkey '^N' default_dot
+
 CMDS_ON_ENTER=(ll gs)
 REQUIREMENTS_CMDS_ON_ENTER=(true "git rev-parse")
 function cmd-on-enter {