GNU logs - #56838, boring messages

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Subject: bug#56838: 28.1.90; `current-indentation' sometimes returns zero inside invisible text
Resent-From: Ihor Radchenko <yantar92@HIDDEN>
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From: Ihor Radchenko <yantar92@HIDDEN>
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Hi,

Try to do the following:
1. emacs -Q
2. M-x outline-mode
3. Insert

* something
  a
* else

4. Move point to "* <point>something"
5. <TAB> to fold the outline
6. M-: (save-excursion (search-forward " a") (current-indentation))
   ;; => 2
7. M-: (remove-from-invisibility-spec '(outline . t))
8. M-: (add-to-invisibility-spec '(outline))
9. M-: (save-excursion (search-forward " a") (current-indentation))
   ;; => 0; expected: => 2

First reported in https://orgmode.org/list/87k0h49s7z.fsf@localhost   

Best,
Ihor

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Ihor Radchenko <yantar92@HIDDEN>
Subject: bug#56838: Acknowledgement (28.1.90; `current-indentation'
 sometimes returns zero inside invisible text)
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forcemerge 56837 56838
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Subject: Re: bug#60692: 29.0.60; current-indentation wrong without outline
 ellipsis
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forcemerge 56837 60692
thanks

> About current-indentation: it skips invisible text, so it's unclear to
> me why you expected to see 2.  The doc string says:
>
>   Text that has an invisible property is considered as having width 0, unless
>   `buffer-invisibility-spec' specifies that it is replaced by an ellipsis.
>
> The "current indentation" on the line of buffer position 8 is entirely
> in invisible text, and current-indentation only accounts for _visible_
> whitespace, per the above documentation.

Thanks for the reference, it explains the problem.
But this is a very strange logic.  I don't get it.
Why it depends on the presence of the ellipsis
and fails without it?

Now I see this bug report is a duplicate of bug#56837.
This is a problem because modes use 'current-indentation'
to get an outline level in 'outline-level' function, e.g.

  (setq-local outline-level
              (lambda ()
                "`outline-level' function for Python mode."
                (1+ (/ (current-indentation) python-indent-offset))))

  (setq-local outline-level (lambda () (1+ (/ (current-indentation)
                                         ruby-indent-level))))

But this fails when users want to remove an ellipsis.

Last modified: Tue, 10 Jan 2023 08:30:02 UTC

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