bug#49742: 28.0.50; previous-single-property-change sometimes wrong?

[T.V Raman]

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 ')'

   --Raman


In GNU Emacs 28.0.50 (build 13, x86_64-pc-linux-gnu, GTK+ Version 3.24.24, 
cairo version 1.16.0)
 of 2021-07-22 built on raman-glaptop
Repository revision: 5b868503f53f1cf67388238f825518bfe30398fd
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Debian GNU/Linux rodete

Configured using:
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Configured features:
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Major mode: Text

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Load-path shadows:
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/home/raman/.emacs.d/elpa/ivy-20210602.1349/elpa
/home/raman/.emacs.d/elpa/transient-20210723.1601/transient hides 
/usr/local/share/emacs/28.0.50/lisp/transient
/home/raman/emacs/lisp/emacspeak/lisp/tetris hides 
/usr/local/share/emacs/28.0.50/lisp/play/tetris

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-- 

Thanks,

--Raman(I Search, I Find, I Misplace, I Research)
♉ Id: kg:/m/0285kf1  🦮

-- 

Thanks,

--Raman(I Search, I Find, I Misplace, I Research)
♉ Id: kg:/m/0285kf1  🦮