bug#52914: 29.0.50; pgtk menu lag using mouse - very slow for menu item to appear/disappear

[bhrgunatha]

In GNU Emacs 29.0.50 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.31, cairo version 1.17.4)
 of 2021-12-31 built on starch
Repository revision: c452ffe4c28da21991f1f98007fbe1d66c7e0538
Repository branch: master
System Description: Arch Linux

Configured using:
 'configure --prefix=/usr --sysconfdir=/etc --libexecdir=/usr/lib
 --localstatedir=/var --mandir=/usr/share/man --with-gameuser=:games
 --with-sound=alsa --with-modules --without-libotf --without-m17n-flt
 --without-gconf --without-gsettings --enable-link-time-optimization
 --with-native-compilation --with-xinput2 --with-pgtk --without-xaw3d
 --with-sound=alsa --with-xwidgets --without-gpm
 --without-compress-install
 '--program-transform-name=s/\([ec]tags\)/\1.emacs/'
 'CFLAGS=-march=x86-64 -mtune=generic -O2 -pipe -fno-plt -fexceptions
 -Wp,-D_FORTIFY_SOURCE=2 -Wformat -Werror=format-security
 -fstack-clash-protection -fcf-protection'
 LDFLAGS=-Wl,-O1,--sort-common,--as-needed,-z,relro,-z,now'

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

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

Major mode: Lisp Interaction

Minor modes in effect:
  pcre-mode: t
  paredit-mode: t
  rainbow-delimiters-mode: t
  global-company-mode: t
  company-mode: t
  which-key-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  projectile-mode: t
  ido-vertical-mode: t
  all-the-icons-ivy-rich-mode: t
  ivy-rich-mode: t
  ivy-mode: t
  delete-selection-mode: t
  all-the-icons-ibuffer-mode: t
  override-global-mode: t
  global-display-line-numbers-mode: t
  display-line-numbers-mode: t
  global-hl-line-mode: t
  global-display-fill-column-indicator-mode: t
  minibuffer-depth-indicate-mode: t
  windmove-mode: t
  global-so-long-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  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
  window-divider-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/bhrgunatha/.emacs.d/elpa/transient-20211226.738/transient hides /usr/share/emacs/29.0.50/lisp/transient

Features:
(shadow sort mail-extr emacsbug message yank-media rmc puny rfc822 mml
mml-sec epa derived epg rfc6068 epg-config gnus-util time-date mm-decode
mm-bodies mm-encode mailabbrev gmm-utils mailheader sendmail mail-utils
mule-util time keychain-environment pcre2el rxt re-builder pp server
paredit rainbow-delimiters smartparens dash company-oddmuse
company-keywords company-etags etags fileloop generator company-gtags
company-dabbrev-code company-dabbrev company-files company-clang
company-capf company-cmake company-semantic company-template
company-bbdb company pcase which-key yasnippet moe-theme moe-dark-theme
moe-light-theme powerline powerline-separators powerline-themes
projectile lisp-mnt mail-parse rfc2231 rfc2047 rfc2045 mm-util
ietf-drums mail-prsvr grep ibuf-ext thingatpt counsel xdg xref project
dired dired-loaddefs compile text-property-search comint ansi-color
swiper ido-vertical-mode ido diminish edmacro kmacro
all-the-icons-ivy-rich ivy-rich ivy delsel ring ivy-faces ivy-overlay
colir color all-the-icons-ibuffer all-the-icons all-the-icons-faces
data-material data-weathericons data-octicons data-fileicons
data-faicons data-alltheicons ibuffer ibuffer-loaddefs use-package
use-package-ensure use-package-delight use-package-diminish
use-package-bind-key bind-key keys visuals display-line-numbers hl-line
easy-mmode display-fill-column-indicator settings mb-depth comp
comp-cstr warnings cl-extra help-mode windmove so-long definitions
advice use-package-core finder-inf rx info package browse-url url
url-proxy url-privacy url-expand url-methods url-history url-cookie
url-domsuf url-util mailcap url-handlers url-parse auth-source cl-seq
eieio eieio-core cl-macs eieio-loaddefs password-cache json map url-vars
seq gv subr-x byte-opt bytecomp byte-compile cconv cl-loaddefs cl-lib
custom-init custom-settings 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 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 keymap
hashtable-print-readable backquote threads xwidget-internal dbusbind
inotify dynamic-setting font-render-setting cairo move-toolbar gtk
x-toolkit pgtk lcms2 multi-tty make-network-process native-compile
emacs)

Memory information:
((conses 16 402402 183537)
 (symbols 48 26146 1)
 (strings 32 127928 54445)
 (string-bytes 1 4060893)
 (vectors 16 42958)
 (vector-slots 8 708041 179105)
 (floats 8 681 1062)
 (intervals 56 405 0)
 (buffers 992 13))

Using the new pgtk flag to compile, menu bar items are very slow to
appear using a mouse e.g. clicking the Tools menu, the menu appears
after about a second delay.

Similarly clicking to dismiss menus or select/de-select sub menus
are delayed too.

There is no delay using the keyboard (F10).

Moving between menus with the keyboard has no delay either.

I'm not sure if related, but scrolling a buffer using the mouse wheel is
is also not as smooth as before. 

Using --with-x-toolkit=gtk3 instead of --with-pgtk does not lag.

Regards,

bhrgunatha