bug#56837: 28.1.90; `current-indentation' sometimes returns zero inside invisible text

[Eli Zaretskii]

> From: Ihor Radchenko <yantar92@gmail.com>
> Cc: 56837@debbugs.gnu.org
> Date: Sat, 30 Jul 2022 19:27:09 +0800
> 
> A simpler version would be let-binding buffer-invisibility-spec.

Really?

> Note that there is similar issue with current-column, though
> current-column is much less likely to be used without considering
> display properties.

These are all display-related, in that their results are supposed to
closely reflect what will be shown on display.

> Would it be possible to include the "text" versions of
> current-indentation and current-column into Emacs?
> 
> Something like
> 
> (defmacro org-current-text-indentation ()
>   "Like `current-indentation', but ignore display/invisible properties."
>   `(let ((buffer-invisibility-spec nil))
>      (current-indentation)))
> 
> (defmacro org-current-text-column ()
>   "Like `current-column', but ignore display/invisible properties."
>   `(string-width (buffer-substring-no-properties
>                 (line-beginning-position) (point))))

Sounds strange to have this, but if Lars thinks it's useful, I won't
object.

> If not, could you at least mention the invisible text issues in
> `current-indentation' docstring?

OK.