bug#43128: 27.1; DPI change not detected after switching to Emacs 27.1

[Vincent Bernat]

After upgrading from Emacs 26.3 (GTK backend) to Emacs 27.1 (GTK
backend), DPI changes are not detected anymore. I am using a laptop with
a HiDPI screen (144 dpi) and when switching to a regular external DPI
monitor (96 dpi), nothing is scaled down.

The change is signalled through XSETTINGS (using xsettingsd daemon in my
case). I have tried to look at the source code to check if there was a
way to detect if the change was detected but not applied, without
success. Also, a new frame on the same display still has its fonts
scaled incorrectly.

Thanks.



In GNU Emacs 27.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.22, cairo 
version 1.16.0)
 of 2020-08-24, modified by Debian built on x86-grnet-01
Windowing system distributor 'The X.Org Foundation', version 11.0.12008000
System Description: Debian GNU/Linux bullseye/sid

Recent messages:
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Configured using:
 'configure --build x86_64-linux-gnu --prefix=/usr
 --sharedstatedir=/var/lib --libexecdir=/usr/lib
 --localstatedir=/var/lib --infodir=/usr/share/info
 --mandir=/usr/share/man --enable-libsystemd --with-pop=yes
 
--enable-locallisppath=/etc/emacs:/usr/local/share/emacs/27.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/27.1/site-lisp:/usr/share/emacs/site-lisp
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 x86_64-linux-gnu --prefix=/usr --sharedstatedir=/var/lib
 --libexecdir=/usr/lib --localstatedir=/var/lib
 --infodir=/usr/share/info --mandir=/usr/share/man --enable-libsystemd
 --with-pop=yes
 
--enable-locallisppath=/etc/emacs:/usr/local/share/emacs/27.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/27.1/site-lisp:/usr/share/emacs/site-lisp
 --with-sound=alsa --without-gconf --with-mailutils --with-cairo
 --with-x=yes --with-x-toolkit=gtk3 --with-toolkit-scroll-bars
 'CFLAGS=-g -O2 -fdebug-prefix-map=/build/emacs-ad1UB1/emacs-27.1+1=.
 -fstack-protector-strong -Wformat -Werror=format-security -Wall'
 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro'

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

Important settings:
  value of $LC_MESSAGES: en_US.utf8
  value of $LANG: fr_FR.utf8
  locale-coding-system: utf-8-unix

Major mode: C/*l

Minor modes in effect:
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/home/bernat/.emacs.d/site-lisp/org-9.3.6/ob-plantuml hides 
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/home/bernat/.emacs.d/site-lisp/org-9.3.6/org-archive hides 
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/home/bernat/.emacs.d/site-lisp/org-9.3.6/ob-lilypond hides 
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/home/bernat/.emacs.d/site-lisp/org-9.3.6/ob-awk hides 
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/home/bernat/.emacs.d/site-lisp/org-9.3.6/ob-groovy hides 
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/home/bernat/.emacs.d/site-lisp/org-9.3.6/org-entities hides 
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/home/bernat/.emacs.d/site-lisp/org-9.3.6/ox-man hides 
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/home/bernat/.emacs.d/site-lisp/org-9.3.6/ol-irc hides 
/usr/share/emacs/27.1/lisp/org/ol-irc
/home/bernat/.emacs.d/site-lisp/org-9.3.6/ol-eshell hides 
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/home/bernat/.emacs.d/site-lisp/org-9.3.6/org-num hides 
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/home/bernat/.emacs.d/site-lisp/org-9.3.6/ob-perl hides 
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/home/bernat/.emacs.d/site-lisp/org-9.3.6/ob-stan hides 
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/home/bernat/.emacs.d/site-lisp/org-9.3.6/ox-org hides 
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/home/bernat/.emacs.d/site-lisp/org-9.3.6/org-keys hides 
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/home/bernat/.emacs.d/site-lisp/org-9.3.6/ox hides 
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Features:
(shadow emacsbug hippie-exp misearch multi-isearch lua-mode autoload
cl-print debug rect term/screen term/xterm xterm markdown-mode
edit-indirect cursor-sensor js2-mode warnings js cc-mode cc-fonts
cc-guess cc-menus cc-cmds cc-styles cc-align cc-engine cc-vars cc-defs
jinja2-mode sgml-mode yaml-mode shr-color rst dumb-jump popup projectile
grep ibuf-ext ibuffer ibuffer-loaddefs python tramp-sh tramp
tramp-loaddefs trampver tramp-integration files-x tramp-compat ls-lisp
pp bbdb-message sendmail git-rebase nix-mode ffap smie nix-repl
nix-shell nix-store nix-instantiate nix-shebang nix-format nix gnus-kill
mule-util flow-fill mm-archive url-http url-gw url-auth epa-file dbus
sort gnus-cite qp gnus-async gnus-bcklg emojify apropos tar-mode
arc-mode archive-mode ht gnus-ml gnus-agent gnus-srvr gnus-score
score-mode nnvirtual nndraft nnmh utf-7 gnus-cache bbdb-gnus
network-stream nntp vbe-gnus bbdb-mua vbe-gnus-identities
gnus-identities vbe-gnus-looks gnus-topic vbe-gnus-general gnus-gravatar
mail-extr gravatar url-cache spam spam-stat bbdb-com bbdb bbdb-site
timezone gnus-uu yenc vbe-mbsync nnir gnus-icalendar org-capture
vbe-orgmode ox-reveal ox-odt rng-loc rng-uri rng-parse rng-match rng-dt
rng-util rng-pttrn nxml-parse nxml-ns nxml-enc xmltok nxml-util ox-latex
ox-icalendar ox-html table ox-ascii ox-publish ox org-element avl-tree
htmlize cl ob-async ob-shell ob-python org-tempo tempo org-clock org ob
ob-tangle ob-ref ob-lob ob-table ob-exp org-macro org-footnote org-src
ob-comint org-pcomplete org-list org-faces org-entities noutline outline
org-version ob-emacs-lisp ob-core ob-eval org-table ol org-keys
org-compat org-macs org-loaddefs icalendar diary-lib diary-loaddefs
cal-menu calendar cal-loaddefs gnus-msg gnus-art mm-uu mml2015 mm-view
mml-smime smime dig gnus-sum url url-proxy url-privacy url-expand
url-methods url-history mailcap shr url-cookie url-domsuf url-util svg
xml dom gnus-group gnus-undo gnus-start gnus-cloud nnimap nnmail
mail-source utf7 netrc nnoo parse-time iso8601 gnus-spec gnus-int
gnus-range gnus-win gnus nnheader helpful trace edebug backtrace
info-look elisp-refs loop bug-reference magit-extras magit-submodule
magit-obsolete magit-popup magit-blame magit-stash magit-reflog
magit-bisect magit-push magit-pull magit-fetch magit-clone magit-remote
magit-commit magit-sequence magit-notes magit-worktree magit-tag
magit-merge magit-branch magit-reset magit-files magit-refs magit-status
magit magit-repos magit-apply magit-wip magit-log which-func magit-diff
smerge-mode diff magit-core magit-autorevert magit-margin
magit-transient magit-process magit-mode thingatpt vc-git diff-mode
dtrt-indent disp-table paredit whitespace highlight-parentheses
vbe-server vbe-apps vbe-programming eros company-oddmuse
company-keywords company-etags etags fileloop generator company-gtags
company-dabbrev-code company-dabbrev company-files company-capf
company-cmake company-xcode company-clang company-semantic company-eclim
company-template company-bbdb company flycheck-package package-lint
let-alist imenu finder flycheck find-func git-commit with-editor shell
pcomplete transient async-bytecomp async server magit-git magit-section
magit-utils crm log-edit message format-spec rfc822 mml mml-sec epa epg
epg-config gnus-util rmail rmail-loaddefs text-property-search time-date
mailabbrev mail-utils gmm-utils mailheader pcvs-util add-log
vbe-ergonomics autorevert filenotify saveplace counsel xdg xref project
dired dired-loaddefs compile comint ansi-color swiper smex ido ivy
delsel ring jka-compr colir ivy-overlay which-key auto-compile pcase
packed vbe-looks page-break-lines spaceline-config spaceline-segments
spaceline powerline advice powerline-separators color powerline-themes
naquadah-theme hl-line paren vbe-common exec-path-from-shell
dash-functional f dash s vbe-package quelpa-use-package quelpa mm-decode
mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045 mm-util
ietf-drums mail-prsvr lisp-mnt help-fns radix-tree cus-edit cus-start
cus-load wid-edit diminish cl-extra help-mode use-package
use-package-ensure use-package-delight use-package-diminish
use-package-bind-key bind-key easy-mmode use-package-core derived
finder-inf tex-site edmacro kmacro rx dpkg-dev-el info debian-el vbe-tls
nsm rmc tls gnutls puny package easymenu browse-url url-handlers
url-parse auth-source cl-seq eieio eieio-core cl-macs eieio-loaddefs
password-cache json subr-x map url-vars seq byte-opt gv bytecomp
byte-compile cconv cl-loaddefs cl-lib 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 tab-bar menu-bar rfn-eshadow isearch timer
select scroll-bar mouse jit-lock font-lock syntax facemenu 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 charscript charprop case-table epa-hook
jka-cmpr-hook help simple abbrev obarray 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 lcms2 dynamic-setting
system-font-setting font-render-setting cairo move-toolbar gtk x-toolkit
x multi-tty make-network-process emacs)

Memory information:
((conses 16 1554451 810098)
 (symbols 48 73742 4)
 (strings 32 391691 79664)
 (string-bytes 1 18314672)
 (vectors 16 150772)
 (vector-slots 8 4494952 144006)
 (floats 8 818 1868)
 (intervals 56 52958 19479)
 (buffers 1000 149))