bug#56832: 29.0.50; Emacs pgtk started on low-DPI doesn't adapt to hi-DPI

["Olivier Crête" <olivier.crete@ocrete.ca>]

Hi,

If I start emacs on my low DPI screen (a normal 1080p screen), when I
switch it to another screen which is 4K, it doesn't adapt correctly but
instead I get the blurry scaling from the compositor. I'd expect it to
listen to the appropriate Wayland events and change its internal
scaling factor.

This is all using master built with pgtk (from the copr).

Olivier

In GNU Emacs 29.0.50 (build 1, x86_64-redhat-linux-gnu, GTK+ Version
3.24.34, cairo version 1.17.6)
 of 2022-07-14 built on a522b9aae9cf45e9868103ec13e1f348
System Description: Fedora Linux 36 (Workstation Edition)

Configured using:
 'configure --build=x86_64-redhat-linux-gnu
 --host=x86_64-redhat-linux-gnu --program-prefix=
 --disable-dependency-tracking --prefix=/usr --exec-prefix=/usr
 --bindir=/usr/bin --sbindir=/usr/sbin --sysconfdir=/etc
 --datadir=/usr/share --includedir=/usr/include --libdir=/usr/lib64
 --libexecdir=/usr/libexec --localstatedir=/var
 --sharedstatedir=/var/lib --mandir=/usr/share/man
 --infodir=/usr/share/info --with-dbus --with-gif --with-jpeg --with-
png
 --with-rsvg --with-tiff --with-xft --with-xpm --with-gpm=no
 --with-xwidgets --with-modules --with-harfbuzz --with-cairo --with-
json
 --with-pgtk --with-native-compilation --enable-link-time-optimization
 build_alias=x86_64-redhat-linux-gnu host_alias=x86_64-redhat-linux-gnu
 CC=gcc 'CFLAGS=-DMAIL_USE_LOCKF -O2 -flto=auto -ffat-lto-objects
 -fexceptions -g -grecord-gcc-switches -pipe -Wall
 -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2
 -Wp,-D_GLIBCXX_ASSERTIONS
 -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-
strong
 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic
 -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection'
 LDFLAGS=-Wl,-z,relro
 PKG_CONFIG_PATH=:/usr/lib64/pkgconfig:/usr/share/pkgconfig CXX=g++
 'CXXFLAGS=-O2 -flto=auto -ffat-lto-objects -fexceptions -g
 -grecord-gcc-switches -pipe -Wall -Werror=format-security
 -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS
 -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-
strong
 -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1 -m64 -mtune=generic
 -fasynchronous-unwind-tables -fstack-clash-protection -fcf-
protection''

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG
JSON
LCMS2 LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY
INOTIFY PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS XIM XWIDGETS GTK3 ZLIB

Important settings:
  value of $LANG: en_CA.utf8
  value of $XMODIFIERS: @im=ibus
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
  global-whitespace-mode: t
  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:
/home/ocrete/.emacs.d/elpa/transient-0.3.7/transient hides
/usr/share/emacs/29.0.50/lisp/transient

Features:
(shadow sort mail-extr emacsbug message yank-media dired dired-loaddefs
rfc822 mml mml-sec epa epg rfc6068 epg-config gnus-util time-date
mm-decode mm-bodies mm-encode mailabbrev gmm-utils mailheader sendmail
mail-utils cl-extra shortdoc text-property-search help-fns radix-tree
help-mode whitespace cus-load gtimelog derived cl hi-lock url-http
url-auth url-gw nsm puny mail-parse rfc2231 rfc2047 rfc2045 mm-util
ietf-drums mail-prsvr finder-inf emacs-goodies-loaddefs clang-rename
clang-include-fixer let-alist clang-format xml info package browse-url
url url-proxy url-privacy url-expand url-methods url-history url-cookie
generate-lisp-file url-domsuf url-util mailcap url-handlers url-parse
auth-source cl-seq eieio eieio-core cl-macs password-cache json subr-x
map byte-opt gv bytecomp byte-compile cconv url-vars cl-loaddefs cl-lib
rmc iso-transl tooltip eldoc paren electric uniquify ediff-hook vc-
hooks
lisp-float-type elisp-mode mwheel term/pgtk-win pgtk-win term/common-
win
pgtk-dnd 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
nadvice seq simple cl-generic indonesian philippine 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 abbrev obarray oclosure
cl-preloaded button loaddefs faces cus-face macroexp files window
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget keymap hashtable-print-readable backquote threads
xwidget-internal dbusbind inotify dynamic-setting system-font-setting
font-render-setting cairo gtk pgtk lcms2 multi-tty make-network-process
native-compile emacs)

Memory information:
((conses 16 128041 9251)
 (symbols 48 10824 0)
 (strings 32 36158 2282)
 (string-bytes 1 1133447)
 (vectors 16 18727)
 (vector-slots 8 392717 7091)
 (floats 8 81 88)
 (intervals 56 380 0)
 (buffers 992 12))

-- 
Olivier Crête
olivier.crete@ocrete.ca