GNU bug report logs - #41957
27.0.91; overlay-put freeze with auto-composition-mode ligatures

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: "James N. V. Cash" <james.nvc <at> gmail.com>
Subject: bug#41957: closed (Re: bug#41957: 27.0.91; overlay-put freeze
 with auto-composition-mode ligatures)
Date: Sat, 20 Jun 2020 06:53:02 +0000

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

Your bug report

#41957: 27.0.91; overlay-put freeze with auto-composition-mode ligatures

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 41957 <at> debbugs.gnu.org.

-- 
41957: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=41957
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Eli Zaretskii <eliz <at> gnu.org>
To: "James N. V. Cash" <james.nvc <at> gmail.com>
Cc: 41957-done <at> debbugs.gnu.org
Subject: Re: bug#41957: 27.0.91;
 overlay-put freeze with auto-composition-mode ligatures
Date: Sat, 20 Jun 2020 09:52:38 +0300

> From: "James N. V. Cash" <james.nvc <at> gmail.com>
> Date: Fri, 19 Jun 2020 17:05:30 -0400
> 
> It seems that when putting the after-string property to an overlay, if
> auto-composition-mode is enabled and the string contains a ligature,
> Emacs freezes in overlay-put.
> 
> The below code freezes when starting with emacs -Q:
> 
> 
>     (auto-composition-mode)
>     (set-char-table-range composition-function-table ?= `(["=>" 0 compose-gstring-for-graphic]))
>     (let ((o (make-overlay (point-min) (+ (point-min) 3) (current-buffer))))
>       (overlay-put o 'after-string "=>"))

Thanks, this is a known bug that is already fixed on the master
branch, and will be available in Emacs 28.

[Message part 3 (message/rfc822, inline)]

From: "James N. V. Cash" <james.nvc <at> gmail.com>
To: bug-gnu-emacs <at> gnu.org
Subject: 27.0.91; overlay-put freeze with auto-composition-mode ligatures
Date: Fri, 19 Jun 2020 17:05:30 -0400

It seems that when putting the after-string property to an overlay, if
auto-composition-mode is enabled and the string contains a ligature,
Emacs freezes in overlay-put.

The below code freezes when starting with emacs -Q:


    (auto-composition-mode)
    (set-char-table-range composition-function-table ?= `(["=>" 0 compose-gstring-for-graphic]))
    (let ((o (make-overlay (point-min) (+ (point-min) 3) (current-buffer))))
      (overlay-put o 'after-string "=>"))

If auto-composition-mode is disabled or the string doesn't contain any ligatures, it works as expected.

Additionally, if I create the overlay then enable auto-composition-mode afterwards, it then freezes.

In GNU Emacs 27.0.91 (build 2, x86_64-pc-linux-gnu, GTK+ Version 3.22.30, cairo version 1.15.10)
 of 2020-06-17 built on gonk
Repository revision: c36c5a3dedbb2e0349be1b6c3b7567ea7b594f1c
Repository branch: HEAD
Windowing system distributor 'The X.Org Foundation', version 11.0.11906000
System Description: Ubuntu 18.04.4 LTS

Configured using:
 'configure --with-xwidgets --with-cairo'

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY
INOTIFY GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS XWIDGETS
LIBSYSTEMD JSON PDUMPER LCMS2 GMP

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

Memory information:
((conses 16 2130544 1191815)
 (symbols 48 73065 806)
 (strings 32 1403710 33264)
 (string-bytes 1 60271301)
 (vectors 16 387820)
 (vector-slots 8 5073825 225022)
 (floats 8 91573 10867)
 (intervals 56 39918 6792)
 (buffers 1000 121))

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