[vim/vim] `^[[[O` `^[[[I` appeared while using `wl_clipboard` (Issue #21217)

[Mao-Yining]

mao-yining created an issue (vim/vim#21217)

### Steps to reproduce

```vim
vim9script

def Available(): bool
return executable('wl-copy') && executable('wl-paste')
enddef

def Copy(reg: string, type: string, str: list<string>)
var args = "wl-copy"

if reg == "*"
args ..= " -p"
endif

system(args, str)
enddef

def Paste(reg: string): tuple<string, list<string>>
var args = "wl-paste --type text/plain;charset=utf-8"

if reg == "*"
args ..= " -p"
endif

return ("", systemlist(args))
enddef

v:clipproviders["wl_clipboard"] = {
available: Available,
copy: {
"+": Copy,
"*": Copy
},
paste: {
"+": Paste,
"*": Paste
}
}

set clipmethod=wl_clipboard
```
Ghost `^[[[O` `^[[[I` appear.

https://github.com/user-attachments/assets/7d3d5ca0-a64e-43f2-b0b3-127167b8ba7e

### Expected behaviour

[Éric NICOLAS]

ccjmne left a comment (vim/vim#21217)

Just providing additional information purely for context.

It's not quite ^[[[I and ^[[[O you're seeing, but rather ^[[I and ^[[O.

They're CSI escape sequences, albeit not ANSI ones, but well-established ones (de-facto standard) from DEC:
When you enable focus reporting within a terminal (emulator), you will receive CSI I (that is, ^[[I) whenever your terminal and/or running process gets focused IN, and CSI O (that is, ^[[O) when your running process or terminal loses the focus.

We could indeed avoid printing it in some edge cases! I've encountered it before doing something else as well.

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[dezza]

dezza left a comment (vim/vim#21217)

is there any reason you're using wl-copy and wl-paste directly instead of the builtin integration?

I encounter these also while using ghostty and calling external commands but haven't collected enough yet to come to a conclusion, it could be a regression in term.c

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[Mao-Yining]

mao-yining left a comment (vim/vim#21217)

is there any reason you're using wl-copy and wl-paste directly instead of the builtin integration?

Gnome don't support ext_data_control|zwlr_data_control. So I can't use clipboard in TUI. What's more if compiled vim with gtk4. xterm_clipboard is forbidden.

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