bug#17181: 24.4.50; previous-single-property-change: odd behavior

[T.V Raman]

Function previous-single-property-change appears to have an odd bug, try
this in a new buffer:

M-x switch-to-buffer RET foo 
to create a  buffer in fundamental-mode.

Type 
foo RET
bar
Move to the beginning of the line with bar
Evaluate 
(put-text-property (point) (point-max) 'test t)
Move point to the front of "bar" ie  point is at the beginning of the
line.
(get-text-property (point) 'test) returns T as expected.
(point) evaluates to 6

Consequently, I'd  expect 
(previous-single-property-change (point) 'test) to return 5 
instead you get: nil

get-text-property does show that there is no text-property 'test set at
positions 5, 4 etc -- 
previous-single-property-change behaves as I had expected if I evaluate
the same form with point on "a" 
ie it returns where the property changes from t to nil

It looks  like previous-single-property-change might have an off-by-one
bug in that it is examining property on preceding-char?







In GNU Emacs 24.4.50.2 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.10)
 of 2014-04-03 on lapdog
System Description:     Ubuntu 12.04.1 LTS

Configured using:
 `configure --prefix=/usr/local --without-compress-install'

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  recentf-mode: t
  semantic-mode: t
  ido-everywhere: t
  display-time-mode: t
  jabber-activity-mode: t
  jabber-mode-line-mode: t
  erc-list-mode: t
  erc-menu-mode: t
  erc-autojoin-mode: t
  erc-ring-mode: t
  erc-networks-mode: t
  erc-pcomplete-mode: t
  erc-track-mode: t
  erc-match-mode: t
  erc-button-mode: t
  erc-fill-mode: t
  erc-stamp-mode: t
  erc-netsplit-mode: t
  erc-irccontrols-mode: t
  erc-noncommands-mode: t
  erc-move-to-prompt-mode: t
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  transient-mark-mode: t

Recent input:
C-e m ESC x a d SPC d e a TAB RET j a b b e r SPC r 
o TAB RET C-x C-j C-c C-e m C-e a C-x @ h s c d RET 
c d SPC / t m TAB RET C-x C-f b u g RET ESC < C-@ C-s 
G N U ESC m ESC m C-p C-@ ESC < C-x r s 1 C-x k RET 
C-x b f o o C-j C-e m c d RET C-x b f o o C-j ESC x 
f u n d TAB RET ESC < ESC x r e p o TAB t ESC DEL r 
e p o r t SPC e m TAB RET

Recent messages:
/tmp 
Mark activated
Copied 32 lines to register 1
Loading /home/raman/.recentf...done
Cleaning up the recentf list...done (0 removed)
Back to top level.
Loading voice-setup...done
~ 
Making completion list...
End of buffer 

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