GNU bug report logs - #26742
Display bug with composed strings

Previous Next

Full log

Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Clément Pit--Claudel <clement.pitclaudel <at> live.com>
To: bug-gnu-emacs <at> gnu.org
Subject: Display bug with composed strings
Date: Tue, 2 May 2017 02:58:19 -0400

[Message part 1 (text/plain, inline)]

Hi bug-gnu-emacs,

If I create a file temp.txt containing the following:

-*- prettify-symbols-alist: (("R_PO" 8477 (Br . cl) 8804)); -*-
!!! R_PO !!!

and run ‘emacs-24.5 -Q temp.txt -f prettify-symbols-mode’, I observe a surprising display bug: when I move the point across the second line, as soon as the point reaches the blank space after “R_PO”, I see a second ℝ displayed instead of the third “!”.

Concretely, the line looks like “!!! ℝ≤ !!!” until I reach the second blank, and then it changes to “!!ℝ ℝ≤ !!!”.  Resizing the window fixes the issue until the next cursor blink.  Additionally, when the point is on R_PO, the point disappears — and taking a screenshot makes the prettified R_PO (ℝ≤) disappear, too (?!).

Is this a known issue? Can anyone else reproduce it? I have attached a few pictures (all of them show the same buffer text) — let me know if I can provide any other info!

Cheers,
Clément.

In GNU Emacs 26.0.50 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2017-04-16 built on clem-w50-mint
Repository revision: d1a65963ff50d2ebae87ac559514e19788ffc1cc
Windowing system distributor 'The X.Org Foundation', version 11.0.11804000
System Description:	Linux Mint 18.1 Serena

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 LIBSYSTEMD

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

Major mode: Lisp Interaction

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
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message puny seq byte-opt subr-x gv
bytecomp byte-compile cl-extra help-mode cconv cl-loaddefs pcase 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 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 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 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 96057 5153)
 (symbols 48 20438 1)
 (miscs 40 40 129)
 (strings 32 18025 4822)
 (string-bytes 1 576763)
 (vectors 16 14137)
 (vector-slots 8 485275 4358)
 (floats 8 48 68)
 (intervals 56 203 0)
 (buffers 976 11)
 (heap 1024 47991 1074))

[Screenshot from 2017-05-02 02-53-09.png (image/png, attachment)]

[Screenshot from 2017-05-02 02-53-30.png (image/png, attachment)]

[Screenshot from 2017-05-02 02-53-43.png (image/png, attachment)]

[Screenshot from 2017-05-02 02-53-51.png (image/png, attachment)]

[signature.asc (application/pgp-signature, attachment)]

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.