Focus event control sequences becomes visible with this plugin

[moetayuko]

Issue

When focus/unfocus events are fired, their control sequences ^[[I and ^[[O are visible after vim's cursor.

To reproduce

1. Add the following MWE config:

╰─ cat ~/.tmux.conf
set -s focus-events on

╰─ cat mini.vim
set nocp
let &t_fe = "\e[?1004h"
let &t_fd = "\e[?1004l"

call plug#begin()
 Plug 'roxma/vim-tmux-clipboard'
call plug#end()

2. Start tmux
3. Inside tmux, start vim via vim -u mini.vim
4. Focus/unfocus the terminal emulator, then observe the control sequences after the cursor

Env

• tmux 3.3a
• vim 9.0.1676
• Arch Linux