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bug#49742: 28.0.50; previous-single-property-change sometimes wrong?
From: |
T.V Raman |
Subject: |
bug#49742: 28.0.50; previous-single-property-change sometimes wrong? |
Date: |
Mon, 26 Jul 2021 10:19:13 -0700 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
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 ?0?8
- bug#49742: 28.0.50; previous-single-property-change sometimes wrong?, T.V Raman, 2021/07/26
- bug#49742: 28.0.50; previous-single-property-change sometimes wrong?, Eli Zaretskii, 2021/07/26
- bug#49742: 28.0.50; previous-single-property-change sometimes wrong?,
T.V Raman <=
- bug#49742: 28.0.50; previous-single-property-change sometimes wrong?, Eli Zaretskii, 2021/07/26
- bug#49742: 28.0.50; previous-single-property-change sometimes wrong?, T.V Raman, 2021/07/26
- bug#49742: 28.0.50; previous-single-property-change sometimes wrong?, Eli Zaretskii, 2021/07/26
- bug#49742: 28.0.50; previous-single-property-change sometimes wrong?, T.V Raman, 2021/07/26
- bug#49742: 28.0.50; previous-single-property-change sometimes wrong?, Eli Zaretskii, 2021/07/27
- bug#49742: 28.0.50; previous-single-property-change sometimes wrong?, T.V Raman, 2021/07/27
- bug#49742: 28.0.50; previous-single-property-change sometimes wrong?, Andreas Schwab, 2021/07/27
- bug#49742: 28.0.50; previous-single-property-change sometimes wrong?, T.V Raman, 2021/07/27
- bug#49742: 28.0.50; previous-single-property-change sometimes wrong?, Lars Ingebrigtsen, 2021/07/27
- bug#49742: 28.0.50; previous-single-property-change sometimes wrong?, T.V Raman, 2021/07/27