bug#41002: Undo breaks inhibit-read-only text property

[Serhii Mozghovyi <egnartsms@gmail.com>]

Yes, I can reproduce with emacs -Q. My Emacs version is 26.3. Here are
the details:

In GNU Emacs 26.3 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.22.30)
 of 2020-05-01 built on serhii-dell
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description:    CentOS Linux release 7.7.1908 (Core)

Recent messages:
Quit
nil
Read-Only mode enabled in current buffer
Mark set
19 (#o23, #x13, ?\C-s)
20 (#o24, #x14, ?\C-t)
Undo!
Mark activated
kill-region: Text is read-only: #<buffer new>
Making completion list...

Configured using:
 'configure --prefix=/home/serhii/local'

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND DBUS GSETTINGS GLIB NOTIFY LIBSELINUX
GNUTLS LIBXML2 FREETYPE XFT ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM
THREADS

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Fundamental

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny seq byte-opt gv
bytecomp byte-compile cconv cl-loaddefs cl-lib dired dired-loaddefs
format-spec rfc822 mml easymenu mml-sec password-cache epa derived epg
epg-config gnus-util rmail rmail-loaddefs mm-decode mm-bodies mm-encode
mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047
rfc2045 ietf-drums mm-util mail-prsvr mail-utils elec-pair time-date
mule-util tooltip eldoc electric uniquify ediff-hook vc-hooks
lisp-float-type mwheel term/x-win x-win term/common-win x-dnd tool-bar
dnd fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode elisp-mode lisp-mode prog-mode register page menu-bar
rfn-eshadow isearch timer select scroll-bar mouse jit-lock font-lock
syntax facemenu font-core term/tty-colors frame cl-generic cham georgian
utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean
japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european
ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote threads dbusbind
inotify dynamic-setting system-font-setting font-render-setting
move-toolbar gtk x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 95086 6451)
 (symbols 48 20250 1)
 (miscs 40 47 168)
 (strings 32 28285 1382)
 (string-bytes 1 745581)
 (vectors 16 13895)
 (vector-slots 8 500670 14660)
 (floats 8 50 198)
 (intervals 56 235 9)
 (buffers 992 13)
 (heap 1024 24712 1221))

On 5/2/20 8:33 PM, Filipp Gunbin wrote:
> On 01/05/2020 13:38 +0300, Serhii Mozghovyi wrote:
>
>> The inhibit-read-only text property in a read-only buffer does not work
>> with Undo:
>>
> [...]
>
> Cannot reproduce on current master.  Can you reproduce it with emacs -Q?
> Do you have any custom undo functionality? (like a package)
>
> You should file a proper bug report with M-x report-emacs-bug, it will
> automatically include your Emacs version.
>
> Filipp