From: "T.V Raman" via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 49742@debbugs.gnu.org
Subject: bug#49742: 28.0.50; previous-single-property-change sometimes wrong?
Date: Mon, 26 Jul 2021 10:19:13 -0700 [thread overview]
Message-ID: <p91bl6p8032.fsf@google.com> (raw)
In-Reply-To: <83sg01ujgq.fsf@gnu.org> (Eli Zaretskii's message of "Mon, 26 Jul 2021 19:29:41 +0300")
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Eli Zaretskii <eliz@gnu.org> writes:
See below for the results you ask. It does not explain itself because
property 'face is nil at positions 30 and 29.
Contents of help buffer after describe-text-properties below:
Text content at position 28:
Here is a ¡®nil¡¯ button labeled ¡®)¡¯.
There are text properties here:
button (t)
category transient-button-button
command magit-log:-L
[back]
>> Date: Mon, 26 Jul 2021 08:47:07 -0700
>> From: "T.V Raman" via "Bug reports for GNU Emacs,
>> the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
>>
>>
>> This appears to a corner case where previous-single-property-change
>> breaks in a surprizing way.
>>
>> 1. ;;; Evaluate the below to get a string with properties.
>> (setq s
>>
>> #("-L Trace line evolution (-L)
>>
>> History simplification" 0 2 (face transient-blue button (t) category transient-button-button command magit-log:-L) 2 25 (button (t) category transient-button-button command magit-log:-L) 25 27 (face transient-inactive-value button (t) category transient-button-button command magit-log:-L) 27 28 (button (t) category transient-button-button command magit-log:-L) 30 52 (face transient-heading)))
>>
>>
>> 2.;;; Insert into a new buffer
>> (switch-to-buffer "foo")
>> (insert s)
>>
>> 4. ;;; Place point on the 'H' of "history"
>>
>> 5. ;;; eval
>> (previous-single-property-change (point 'face)
>>
>> Instead of returning value of point before the 'H', this returns a
>> value that is unexpected, it returns point past the ')'
>
> What does "M-x describe-text-properties RET" say at the position
> returned by the above previous-single-property-change call? Does that
> value explain the result? If not, why not?
--
Thanks,
--Raman(I Search, I Find, I Misplace, I Research)
7©4 Id: kg:/m/0285kf1 0Ü8
next prev parent reply other threads:[~2021-07-26 17:19 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-26 15:47 bug#49742: 28.0.50; previous-single-property-change sometimes wrong? T.V Raman via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-07-26 16:29 ` Eli Zaretskii
2021-07-26 17:19 ` T.V Raman via Bug reports for GNU Emacs, the Swiss army knife of text editors [this message]
2021-07-26 18:59 ` Eli Zaretskii
2021-07-27 2:02 ` T.V Raman via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-07-27 2:30 ` Eli Zaretskii
2021-07-27 3:06 ` T.V Raman via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-07-27 4:23 ` Eli Zaretskii
2021-07-27 14:50 ` T.V Raman via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-07-27 15:23 ` Andreas Schwab
2021-07-27 15:40 ` T.V Raman via Bug reports for GNU Emacs, the Swiss army knife of text editors
2021-07-27 15:46 ` Lars Ingebrigtsen
2021-07-27 16:02 ` T.V Raman via Bug reports for GNU Emacs, the Swiss army knife of text editors
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