GNU bug report logs - #62637
29.0.60; Issues when displaying images

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Abdul-Lateef Haji-Ali <a.hajiali <at> hw.ac.uk>
Subject: bug#62637: closed (Re: bug#62637: 29.0.60; Issues when displaying
 images)
Date: Sat, 08 Apr 2023 13:03:02 +0000

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

Your bug report

#62637: 29.0.60; Issues when displaying images 

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 62637 <at> debbugs.gnu.org.

-- 
62637: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=62637
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: larsi <at> gnus.org
Cc: 62637-done <at> debbugs.gnu.org, a.hajiali <at> hw.ac.uk
Subject: Re: bug#62637: 29.0.60; Issues when displaying images
Date: Sat, 08 Apr 2023 16:03:13 +0300

> Cc: 62637 <at> debbugs.gnu.org
> Date: Mon, 03 Apr 2023 16:35:02 +0300
> From: Eli Zaretskii <eliz <at> gnu.org>
> 
> As for indentation: put-image uses a different default for the text on
> which it puts the image 'display' property.  That explains why
> re-indentation didn't remove the image in Emacs 28.  Perhaps we should
> modify mm-inline-image to use a non-whitespace text on which to put
> the image?  Can you try that?  Lars, any reason you explicitly used
> whitespace as the STRING argument of insert-image that replaced
> put-image in mm-inline-image?

No further comments, so I've now modified mm-inline-image to use "x"
as the string on which to put the image 'display' property.
Hopefully, this will allow notmuch and other applications to re-indent
images inserted using mm-inline-image.

And with that, I'm closing the bug.

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

From: Abdul-Lateef Haji-Ali <a.hajiali <at> hw.ac.uk>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.60; Issues when displaying images 
Date: Sun, 02 Apr 2023 14:31:12 +0100

It seems that `mm-inline-image` switched to using `insert-image` instead of `put-image` which resulted in some regressions in notmuch that I noticed between emacs 29 and emacs 28.2. However, I tracked down the discrepancy to the following issues in displaying images in emacs-29. 

First the following code (assuming some image in /tmp/tmp.png), executed in "emacs -Q" on either emacs 28.2 or emacs 29:

(let (content-begin
      content-end)
  (goto-char (point-max))
  (insert "\n")
  (setq content-begin (point))
  (insert-image (create-image "/tmp/tmp.png"))
  (setq content-end (point))

  ;; I expect the following line to indent the image (or not).
  ;; instead the image is removed completely
  ;;(indent-rigidly content-begin content-end 1)

  ;; This line should hide the image, but it doesn't
  ;;(overlay-put (make-overlay content-begin content-end) 'invisible t)
  )

Uncommenting each of the two lines of code shows the two issues (explained in comments). These issues appear in both emacs 29 and 28.2 (though they might be specific to MacOS).

Similar code to this example is executed in notmuch when displaying message, but using `mm-inline-image` instead of insert-image:

(let* ((buffer (find-file-noselect "/tmp/tmp.png" t t))
       (handle (list
                buffer '("image/jpeg" (charset))
                nil nil nil nil
                `(image :type jpeg
                        :data ,(with-current-buffer buffer
                                 (buffer-string))
                        :scale 1
                        :transform-smoothing t)
                nil))
       content-begin
       content-end)
  (goto-char (point-max))
  (insert "\n")
  (setq content-begin (point))
  (require 'mm-view)
  (mm-inline-image handle)
  (setq content-end (point))

  ;; I expect the following line to indent the image (or not).
  ;; instead the image is removed completely
  ;;(indent-rigidly content-begin content-end 1)

  ;; This line should hide the image, but it doesn't
  ;;(overlay-put (make-overlay content-begin content-end) 'invisible t)
  )

In this case, in Emacs 29, the behaviour is similar to the "wrong" behaviour of the first example. In Emacs 28.2 on the other hand, the behaviour is what I would expect in both cases (though the undo stack gets messed up and I cannot undo inserting the image. Indenting also doesn't work, but at least the image is not removed)

As a last test, in case it is helpful, I tried the following in emacs 29 using `put-image` instead of `insert-image` (`mm-inline-image` uses in Emacs 28.2 uses `put-image` while in Emacs 29 it uses 'insert-image'), and noticed an equally puzzling behaviour:

(let (content-begin
      content-end)
  (goto-char (point-max))
  (insert "\n")

  (setq content-begin (point))
  (put-image (create-image "/tmp/tmp.png") (point-marker))  
  (setq content-end (point))

  ;; I expect the following line to indent the image (or not).
  ;; instead the image is removed completely
  ;;(indent-rigidly content-begin content-end 1)

  ;; This line should hide the image, but it doesn't
  ;;(overlay-put (make-overlay content-begin content-end) 'invisible t)
)

In this case, `indent-rigidly` does not remove the image, but hiding the overlay does not work.

Best regards,
-- Al

----------------------------------------------------------------------------
In GNU Emacs 29.0.60 (build 1, aarch64-apple-darwin22.3.0, NS
 appkit-2299.40 Version 13.2.1 (Build 22D68)) of 2023-03-22 built on
 HW-R9XXWKPJ4D
Windowing system distributor 'Apple', version 10.3.2299
System Description:  macOS 13.2.1

Configured using:
 'configure --disable-dependency-tracking --disable-silent-rules
 --enable-locallisppath=/opt/homebrew/share/emacs/site-lisp
 --infodir=/opt/homebrew/Cellar/emacs-plus <at> 29/29.0.60/share/info/emacs
 --prefix=/opt/homebrew/Cellar/emacs-plus <at> 29/29.0.60 --with-xml2
 --with-gnutls --with-native-compilation --without-compress-install
 --without-dbus --with-imagemagick --with-modules --with-rsvg --with-ns
 --disable-ns-self-contained 'CFLAGS=-Os -w -pipe
 -mmacosx-version-min=13
 -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk
 -DFD_SETSIZE=10000 -DDARWIN_UNLIMITED_SELECT'
 'CPPFLAGS=-I/opt/homebrew/opt/zlib/include
 -I/opt/homebrew/opt/jpeg/include -I/opt/homebrew/opt/libomp/include
 -I/opt/homebrew/opt/icu4c/include
 -I/opt/homebrew/opt/openssl <at> 1.1/include -isystem/opt/homebrew/include
 -F/opt/homebrew/Frameworks
 -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk'
 'LDFLAGS=-L/opt/homebrew/opt/zlib/lib -L/opt/homebrew/opt/jpeg/lib
 -L/opt/homebrew/opt/libomp/lib -L/opt/homebrew/opt/icu4c/lib
 -L/opt/homebrew/opt/openssl <at> 1.1/lib -L/opt/homebrew/lib
 -F/opt/homebrew/Frameworks -Wl,-headerpad_max_install_names
 -isysroot/Library/Developer/CommandLineTools/SDKs/MacOSX13.sdk''

Configured features:
ACL GIF GLIB GMP GNUTLS IMAGEMAGICK JPEG JSON LCMS2 LIBXML2 MODULES
NATIVE_COMP NOTIFY KQUEUE NS PDUMPER PNG RSVG SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM ZLIB

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

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  show-paren-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
  line-number-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message mailcap yank-media puny dired
dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068
epg-config gnus-util text-property-search time-date mm-decode mm-bodies
mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader cl-loaddefs
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term/common-win tool-bar dnd fontset image regexp-opt fringe
tabulated-list replace newcomment text-mode lisp-mode prog-mode register
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code-pages mule custom widget keymap hashtable-print-readable backquote
threads kqueue cocoa ns lcms2 multi-tty make-network-process
native-compile emacs)

Memory information:
((conses 16 77309 5714)

________________________________
Heriot-Watt University was founded in 1821 and is a registered Scottish charity (SC000278).
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