bug#45834: 28.0.50; Mouse events in terminal emacs

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bug#45834: 28.0.50; Mouse events in terminal emacs

Brady
Tested with emacs -Q -nw, in Terminal.app, with TERM=xterm-256color. The issue does not reproduce with TERM=rxvt.

If I press "C-h k", and then switch to another application, then this is registered as "ESC [ I-", and then upon switching back, as "ESC [ O-". I think this is about mouse events, in and out, or "I" and "O".

I think since I actually have M-[ bound to resize windows (without -Q), then this allows I and O to be passed to emacs and inserted as text, or for more strange behavior in other modes like evil or magit.

I'm not sure if this is considered an emacs problem, or if there is an idea for a workaround, besides perhaps unbinding M-[.

I just tested in a debian VM as well, with snapd's emacs 27.1, and the same issue occurs, C-h k, then M-TAB to switch to other application shows ESC [ I- in minibuffer. Similarly issue is seen with TERM=xterm-256color but not with rxvt.

Thank you,
-Brady

In GNU Emacs 28.0.50 (build 1, x86_64-apple-darwin19.6.0, NS appkit-1894.60 Version 10.15.7 (Build 19H2))
 of 2020-10-25 built on clay.local
Repository revision: 10ea719abcde4f2ee40e717eb846fe93f51d5d79
Repository branch: master
System Description:  Mac OS X 10.15.7

Configured features:
NOTIFY KQUEUE ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS NS MODULES
THREADS PDUMPER

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

Major mode: Lisp Interaction

Minor modes in effect:
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-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
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny dired dired-loaddefs
rfc822 mml mml-sec epa derived epg epg-config gnus-util rmail
rmail-loaddefs auth-source cl-seq eieio eieio-core cl-macs
eieio-loaddefs password-cache json map text-property-search time-date
subr-x mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev
gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util
mail-prsvr mail-utils cl-extra shortdoc seq help-fns radix-tree
help-mode easymenu cl-loaddefs cl-lib term/xterm xterm byte-opt gv
bytecomp byte-compile cconv tooltip eldoc electric uniquify ediff-hook
vc-hooks lisp-float-type mwheel term/ns-win ns-win ucs-normalize
mule-util term/common-win 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 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 kqueue cocoa ns multi-tty
make-network-process emacs)

Memory information:
((conses 16 61436 5322)
 (symbols 48 6973 1)
 (strings 32 19556 966)
 (string-bytes 1 625828)
 (vectors 16 9903)
 (vector-slots 8 124271 9350)
 (floats 8 95 309)
 (intervals 56 351 0)
 (buffers 992 12))