bug#55064: 28.1; Dired not correctly displaying webp files

bug#55064: 28.1; Dired not correctly displaying webp files

[Raoul Comninos]

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If one visits a webp file in Dired using dired-find-file, the file is
visible for a few
seconds only before disappearing. The file is visible if one views it using
image-dired, i.e., by selecting it and invoking C-t d.

In GNU Emacs 28.1 (build 2, x86_64-w64-mingw32)
 of 2022-04-21 built on AVALON
Windowing system distributor 'Microsoft Corp.', version 10.0.19044
System Description: Microsoft Windows 10 Pro (v10.0.2009.19044.1645)

Configured using:
 'configure --with-modules --without-dbus --with-native-compilation
 --without-compress-install CFLAGS=-O2'

Configured features:
ACL GIF GMP GNUTLS HARFBUZZ JPEG JSON LCMS2 LIBXML2 MODULES NATIVE_COMP
NOTIFY W32NOTIFY PDUMPER PNG RSVG SOUND THREADS TIFF TOOLKIT_SCROLL_BARS
XPM ZLIB

(NATIVE_COMP present but libgccjit not available)

Important settings:
  value of $LANG: ENS
  locale-coding-system: cp1252

Major mode: Dired by date

Minor modes in effect:
  recentf-mode: t
  savehist-mode: t
  dired-omit-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  dired-async-mode: t
  dired-hide-details-mode: t
  save-place-mode: t
  global-hi-lock-mode: t
  hi-lock-mode: t
  desktop-save-mode: t
  delete-selection-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  show-paren-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  indent-tabs-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort flyspell ispell mail-extr emacsbug message rfc822 mml
mml-sec epa epg rfc6068 epg-config mm-decode mm-bodies mm-encode
mailabbrev gmm-utils mailheader sendmail eieio-opt speedbar ezimage
dframe shortdoc help-fns radix-tree image-converter image-mode exif
recentf tree-widget two-column savehist writegood-mode multiple-cursors
mc-separate-operations rectangular-region-mode mc-mark-pop mc-edit-lines
mc-hide-unmatched-lines-mode mc-mark-more mc-cycle-cursors
multiple-cursors-core comp comp-cstr warnings rect org-web-tools s eww
xdg url-queue shr kinsoku svg xml browse-url mm-url gnus nnheader
gnus-util rmail rmail-loaddefs text-property-search mail-utils wid-edit
esxml-query dom dash dired-x markdown-mode color thingatpt smart-quotes
org-download org-element avl-tree generator org-attach org-id org-refile
org ob ob-tangle ob-ref ob-lob ob-table ob-exp org-macro org-footnote
org-src ob-comint org-pcomplete pcomplete comint ansi-color org-list
org-faces org-entities noutline outline org-version ob-emacs-lisp
ob-core ob-eval org-table oc-basic bibtex iso8601 time-date ol org-keys
oc org-compat advice org-macs org-loaddefs format-spec find-func
cal-menu calendar cal-loaddefs url-http url url-proxy url-privacy
url-expand url-methods url-history mailcap url-auth mail-parse rfc2231
rfc2047 rfc2045 mm-util ietf-drums mail-prsvr url-cookie url-domsuf
url-util url-gw nsm rmc puny url-parse auth-source eieio eieio-core
eieio-loaddefs password-cache json map url-vars ace-window subr-x
lorem-ipsum unfill yasnippet cl-extra seq byte-opt bytecomp byte-compile
cconv derived help-mode avy-zap avy rx cl-seq ring dired-async
easy-mmode async pcase cl-macs gv dired-aux dired dired-loaddefs
remember edmacro kmacro saveplace hi-lock desktop frameset cl-loaddefs
cl-lib delsel cus-load iso-transl tooltip eldoc paren electric uniquify
ediff-hook vc-hooks lisp-float-type elisp-mode mwheel dos-w32 ls-lisp
disp-table term/w32-win w32-win w32-vars term/common-win tool-bar dnd
fontset image regexp-opt fringe tabulated-list replace newcomment
text-mode lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow
isearch easymenu timer select scroll-bar mouse jit-lock font-lock syntax
font-core term/tty-colors frame minibuffer 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 emoji-zwj charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray
cl-preloaded nadvice button loaddefs faces cus-face macroexp files
window text-properties overlay sha1 md5 base64 format env code-pages
mule custom widget hashtable-print-readable backquote threads w32notify
w32 lcms2 multi-tty make-network-process native-compile emacs)

Memory information:
((conses 16 357770 20461)
 (symbols 48 27232 10)
 (strings 32 83734 3717)
 (string-bytes 1 9457506)
 (vectors 16 36197)
 (vector-slots 8 488485 29730)
 (floats 8 301 289)
 (intervals 56 4794 266)
 (buffers 992 30))

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bug#55064: 28.1; Dired not correctly displaying webp files

[Lars Ingebrigtsen]

Raoul Comninos <revcomninos@gmail.com> writes:

> If one visits a webp file in Dired using dired-find-file, the file is visible for a few
> seconds only before disappearing. The file is visible if one views it using
> image-dired, i.e., by selecting it and invoking C-t d.

I'm unable to reproduce this in Emacs 28.1 on Debian/bookworm with

(setq image-use-external-converter t)

> In GNU Emacs 28.1 (build 2, x86_64-w64-mingw32)
>  of 2022-04-21 built on AVALON

So perhaps it is a Windows-only problem?

In any case, Emacs 29 has native support for webp, so this is probably
fixed there.  Would it be possible for you to check whether this works
better in Emacs 29?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no

bug#55064: 28.1; Dired not correctly displaying webp files

[Lars Ingebrigtsen]

Raoul Comninos <revcomninos@gmail.com> writes:

> Yes, it does work in Emacs 29. 

Thanks for checking.

Since this works in Emacs 29, and Emacs 28 has a different mechanism for
displaying webp images, I don't think this is going to receive any work
for Emacs 28.2 (we're only fixing regressions and very serious bugs on
that branch now), so I'm therefore closing this bug report.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no