GNU bug report logs - #67287
29.1; hs-set-up-overlay messes up indent-sexp

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Package: emacs; Reported by: João Pedro <jpedrodeamorim@HIDDEN>; Keywords: notabug wontfix; dated Sun, 19 Nov 2023 19:36:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Added tag(s) wontfix and notabug. Request was from Eli Zaretskii <eliz@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

Message received at 67287 <at> debbugs.gnu.org:


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Date: Sun, 19 Nov 2023 22:18:38 +0200
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From: Eli Zaretskii <eliz@HIDDEN>
To: =?utf-8?Q?Jo=C3=A3o?= Pedro <jpedrodeamorim@HIDDEN>
In-Reply-To: <87zfz95yf0.fsf@ergo> (message from =?utf-8?Q?Jo=C3=A3o?= Pedro
 on Sun, 19 Nov 2023 16:35:31 -0300)
Subject: Re: bug#67287: 29.1; hs-set-up-overlay messes up indent-sexp
References: <87zfz95yf0.fsf@ergo>
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tags 67287 notabug wontfix
thanks

> From: João Pedro <jpedrodeamorim@HIDDEN>
> Date: Sun, 19 Nov 2023 16:35:31 -0300
> 
> When setting `hs-set-up-overlay' to a custom value, such as the one in
> the docstring for the variable, it messes up the behaviour of
> `indent-sexp' when it is called "before" the s-expression.
> 
> Steps to reproduce:
> 
> 1. Go to any lisp buffer e.g. *scracth*
> 2. Paste the following piece of code
> 
>     (setq hs-set-up-overlay
>           (lambda (ov)
>             (when (eq 'code (overlay-get ov 'hs))
>               (overlay-put ov 'display
>                            (propertize
>                             (format " ... <%d>"
>                                     (count-lines (overlay-start ov)
>                                                  (overlay-end ov)))
>                             'face 'font-lock-type-face)))))
> 
> 3. Evaluate it
> 4. Enable `hs-minor-mode'
> 5. Hide the block with `hs-hide-block' (need to be on the beginning line
>    of the forms)
> 6. Move point either to the first opening parenthesis or the the empty
>    line before the `setq' form
> 
>    (setq
>    ^----
> 
> 7. Call `indent-sexp'
> 8. Open the block with `hs-show-block'
> 
> You should see the following:
> 
>     (setq hs-set-up-overlay
>           (lambda (ov)
>             (when (eq 'code (overlay-get ov 'hs))
>               (overlay-put ov 'display
>                            (propertize
>                             (format " ... <%d>"
>                                     (count-lines (overlay-start ov)
>                                                  (overlay-end ov)))
>                             )
> 
> I tried to investigate why it does that, but couldn't really get to the
> root cause. It seems that its only affected when we're setting the
> `display' prop of the overlay, but I couldn't confirm it either.

Indentation commands align text by columns, and 'display' properties
and invisible text affect those columns (starting from Emacs 29).  So
you shouldn't expect reasonable results from indenting a sexp which is
partially hidden and has a 'display' property that replaces it.  IOW,
always unhide the block before indenting it.

This is not a bug.




Information forwarded to bug-gnu-emacs@HIDDEN:
bug#67287; Package emacs. Full text available.

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From: =?utf-8?Q?Jo=C3=A3o_Pedro?= <jpedrodeamorim@HIDDEN>
To: bug-gnu-emacs@HIDDEN
Subject: 29.1; hs-set-up-overlay messes up indent-sexp
Date: Sun, 19 Nov 2023 16:35:31 -0300
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Acknowledgement sent to João Pedro <jpedrodeamorim@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#67287; Package emacs. Full text available.
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Last modified: Sun, 19 Nov 2023 20:30:02 UTC

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