bug#53353: 29.0.50; spurious <tab-bar> <mouse-movement> events generated by mouse motion in tab-bar

[Mark Kennedy]

This bug occurs in LSP clients (observed for both scala and python) with
many minor modes in effect.  Not feasible to reproduce from -Q.  Mouse motion in
the tab bar (over both a tab name or the white space between them)
generates unwanted "<tab-bar> <mouse-motion>" input events (which are
unbound).  Eli, if this isn't sufficient info, feel free to point me at
where to start looking again.  Thanks.


In GNU Emacs 29.0.50 (build 43, x86_64-pc-linux-gnu, GTK+ Version 3.24.31, 
cairo version 1.17.4)
 of 2022-01-17 built on x1.mofjwutu.com
Repository revision: 2dad332a1439b59a62cd5ed0d8e3626d9e91e3e5
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12014000
System Description: Fedora Linux 35 (Workstation Edition)

Configured using:
 'configure --with-native-compilation'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG JSON
LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY INOTIFY PDUMPER
PNG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS WEBP X11 XDBE
XIM XPM GTK3 ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: @im=none
  locale-coding-system: utf-8-unix

Major mode: Scala

Minor modes in effect:
  shell-dirtrack-mode: t
  lsp-headerline-breadcrumb-mode: t
  lsp-diagnostics-mode: t
  lsp-modeline-workspace-status-mode: t
  lsp-modeline-diagnostics-mode: t
  lsp-modeline-code-actions-mode: t
  lsp-completion-mode: t
  indent-guide-mode: t
  subword-mode: t
  save-place-mode: t
  desktop-save-mode: t
  global-display-line-numbers-mode: t
  display-line-numbers-mode: t
  beacon-mode: t
  pcre-mode: t
  dynamic-completion-mode: t
  msb-mode: t
  winner-mode: t
  savehist-mode: t
  which-function-mode: t
  global-page-break-lines-mode: t
  global-hi-lock-mode: t
  hi-lock-mode: t
  icomplete-mode: t
  dap-tooltip-mode: t
  dap-ui-many-windows-mode: t
  dap-ui-controls-mode: t
  dap-ui-mode: t
  auto-revert-mode: t
  lsp-ui-mode: t
  lsp-ui-doc-mode: t
  lsp-ui-sideline-mode: t
  company-mode: t
  treemacs-filewatch-mode: t
  treemacs-follow-mode: t
  treemacs-git-mode: t
  treemacs-fringe-indicator-mode: t
  lsp-lens-mode: t
  dap-auto-configure-mode: t
  dap-mode: t
  lsp-managed-mode: t
  lsp-mode: t
  yas-minor-mode: t
  flycheck-mode: t
  override-global-mode: t
  hl-todo-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
  tab-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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
/home/mtk/.emacs.d/elpa/transient-20220117.1122/transient hides 
/usr/local/share/emacs/29.0.50/lisp/transient

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rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock
font-lock syntax font-core term/tty-colors frame minibuffer cl-generic
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window text-properties overlay sha1 md5 base64 format env code-pages
mule custom widget keymap hashtable-print-readable backquote threads
dbusbind inotify dynamic-setting system-font-setting font-render-setting
cairo move-toolbar gtk x-toolkit x multi-tty make-network-process
native-compile emacs)

Memory information:
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 (symbols 48 70393 1138)
 (strings 32 431706 277233)
 (string-bytes 1 17004484)
 (vectors 16 240645)
 (vector-slots 8 4030196 877167)
 (floats 8 934 7751)
 (intervals 56 216050 127208)
 (buffers 992 61))