bug#60894: 30.0.50; [PATCH] Add treesit-forward-sexp

[Dmitry Gutov]

On 17/01/2023 22:44, Theodor Thornhill via Bug reports for GNU Emacs, 
the Swiss army knife of text editors wrote:
> 1. What should a sexp be?
>
>    Is it basically "everything", or is there a distincition between
>    "word", "sexp" and "sentence"?  For lisp forward-sexp looks like a
>    "jump over words, or a balanced pair of parens".  In other languages
>    that can look a little weird - consider:
>
>    ```
>    foo().|bar().baz(); -> foo().bar|().baz(); -> foo().bar()|.baz();
>    ```
>    
>    In a sense it could be considered "better", or at least distinct from
>    forward-word to:
>
>    ```
>    foo().|bar().baz(); -> foo().bar()|.baz(); -> foo().bar().baz()|;

One of the key things for Ruby, I think, is to jump over expressions.

E.g. when the point is before 'def' in

  def foo
    ...
  end

forward-sexp jumps to after 'end'. And backward-sexp jumps back.

Same for

  if 2 == 3
    ...
  end

, parenthesized expressions and (less important) method calls and 
statements as well.