t_fe and t_fd in tmux corrupts split with ^[[O

I have this in my vimrc according to ":h xterm-focus-event":

if &term =~ '\v^(screen|tmux)'
let &t_fe = "\<Esc>[?1004h"
let &t_fd = "\<Esc>[?1004l"
endif

With it in tmux, when I switch panes, the pane with Vim running shows a
control sequence "^[[O" where "^[" is Esc. I had to add this autocmd to
circumvent this:

if &term =~ '\v^(screen|tmux)'
augroup autoread
au!
au FocusLost * :redraw!
augroup END
endif

It works well enough in local machine, but over ssh, it causes annoying
flickering. Did anyone face this before (or does now) and solved it?


In .tmux.conf, I have:

set -g escape-time 10 # wait 10ms after Esc key
set -g repeat-time 500 # wait 100ms for repeating command
set -g focus-events on
set -g set-clipboard on
set -g history-limit 5000

set -g default-terminal "tmux-256color"
set -ga terminal-overrides ',xterm-256color*:Tc'
set -as terminal-overrides ',st-256color:Ms=\E]52;%p1%s;%p2%s\007'
set -ga terminal-overrides '*:Ss=\E[%p1%d q:Se=\E[ q'

is_vim="ps -o state= -o comm= -t '#{pane_tty}' \
| grep -iqE '^[^TXZ ]+ +(\\S+\\/)?g?(view|n?vim?x?)(diff)?$'"

bind-key -n C-h if-shell "$is_vim" "send-keys C-h" "select-pane -L"
bind-key -n C-j if-shell "$is_vim" "send-keys C-j" "select-pane -D"
bind-key -n C-k if-shell "$is_vim" "send-keys C-k" "select-pane -U"
bind-key -n C-l if-shell "$is_vim" "send-keys C-l" "select-pane -R"
bind-key -n C-\ if-shell "$is_vim" "send-keys C-\\" "select-pane -l"

The later part of the tmux config lets me switch tmux panes and vim
splits with the same keys. The if-shell syntax is straight-forward but
let me know if it's confusing and I can explain.

The versions of Vim and Tmux I'm using is postscripted.

--
Enan

$ tmux -V
tmux 3.2a

$ vim --version
VIM - Vi IMproved 9.0 (2022 Jun 28, compiled Apr 14 2023 03:28:41)
Included patches: 1-1403
Modified by <amazon-linux-engine@amazon.com>
Compiled by <amazon-linux-engine@amazon.com>
Huge version without GUI. Features included (+) or not (-):
+acl +file_in_path +mouse_urxvt -tag_any_white
+arabic +find_in_path +mouse_xterm -tcl
+autocmd +float +multi_byte +termguicolors
+autochdir +folding +multi_lang +terminal
-autoservername -footer -mzscheme +terminfo
-balloon_eval +fork() +netbeans_intg +termresponse
+balloon_eval_term +gettext +num64 +textobjects
-browse -hangul_input +packages +textprop
++builtin_terms +iconv +path_extra +timers
+byte_offset +insert_expand +perl/dyn +title
+channel +ipv6 +persistent_undo -toolbar
+cindent +job +popupwin +user_commands
-clientserver +jumplist +postscript +vartabs
-clipboard +keymap +printer +vertsplit
+cmdline_compl +lambda +profile +vim9script
+cmdline_hist +langmap -python +viminfo
+cmdline_info +libcall +python3/dyn +virtualedit
+comments +linebreak +quickfix +visual
+conceal +lispindent +reltime +visualextra
+cryptv +listcmds +rightleft +vreplace
+cscope +localmap +ruby/dyn +wildignore
+cursorbind +lua/dyn +scrollbind +wildmenu
+cursorshape +menu +signs +windows
+dialog_con +mksession +smartindent +writebackup
+diff +modify_fname -sodium -X11
+digraphs +mouse -sound -xfontset
-dnd -mouseshape +spell -xim
-ebcdic +mouse_dec +startuptime -xpm
+emacs_tags +mouse_gpm +statusline -xsmp
+eval -mouse_jsbterm -sun_workshop -xterm_clipboard
+ex_extra +mouse_netterm +syntax -xterm_save
+extra_search +mouse_sgr +tag_binary
-farsi -mouse_sysmouse -tag_old_static
system vimrc file: "/etc/vimrc"
user vimrc file: "$HOME/.vimrc"
2nd user vimrc file: "~/.vim/vimrc"
user exrc file: "$HOME/.exrc"
defaults file: "$VIMRUNTIME/defaults.vim"
fall-back for $VIM: "/usr/share/vim"
Compilation: gcc -c -I. -Iproto -DHAVE_CONFIG_H -O2 -g -pipe -Wall -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -DSYS_VIMRC_FILE=/etc/vimrc -D_REENTRANT -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: gcc -Wl,--enable-new-dtags -Wl,-rpath,/usr/lib64/perl5/CORE -Wl,-z,relro -L/usr/local/lib -Wl,--as-needed -o vim -lm -lselinux -lncurses -lrt -lacl -lattr -lgpm -ldl -Wl,--enable-new-dtags -Wl,-rpath,/usr/lib64/perl5/CORE -fstack-protector -L/usr/lib64/perl5/CORE -lperl -lresolv -lnsl -ldl -lm -lcrypt -lutil -lpthread -lc

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