bug#63790: 30.0.50; prog-fill-reindent-defun regression

[Dmitry Gutov <dmitry@gutov.dev>]

On 29/05/2023 19:53, Juri Linkov wrote:
> This regression is in master, not in emacs-29.

If it is a regression, then compared to what? emacs-29 doesn't have this 
function. Compared to some earlier revision?

> 0. emacs-30 -Q
> 1. add to the beginning of the *scratch* buffer a list, so that
> *scratch* looks like this:
> 
> (+
>   1
>      2
>   3)
> 
> ;; This buffer is for text that is not saved, and for Lisp evaluation.
> ;; To create a file, visit it with C-x C-f and enter text in its buffer.
> 
> 2. Activate the region with the beginning at the start of the line with
> the first comment, and the region end with point at the end of the buffer.
> 
> 3. Type 'M-q' (prog-fill-reindent-defun)
> 
> It indents the list instead of the comment.
> 
> But when point is at the region beginning then 'M-q' correctly indents
> the comments.

This happens because in this scenario point ends up outside of the 
comment (at eob). So when the function is called, in looks for a defun.

Did we at some point add (or decide to add) a condition when, if a 
region is active, it should only refill and not reindent?