Feature Request: `meow-line-thing`

[VinceGuidry]

Currently, we can customize the things meow uses for words and symbols with meow-word-thing and meow-symbol-thing. Would be useful to be able to customize the line thing as well. The thing I'm thinking about this for is org mode where I could select a heading instead of a line.

[45mg]

I don't really have time to work on this rn, but here's something to get started with -

(defvar meow-line-thing 'line "TODO docstring")

(defun my/meow-line (n)
  "TODO docstring"
  (interactive "p")
  (meow-next-thing meow-line-thing 'line
                   (if (meow--direction-backward-p)
                       (- n)
                     n))
  (setcar (car meow--selection) 'expand))

If anyone wants to take this forward into a PR - you need to ensure that this behaves exactly the same as meow-line, then you can replace it with this.