[vim/vim] Popup window image feature is laggy when using kitty graphics protocol (Issue #20460)

[Foxe Chen]

64-bitman created an issue (vim/vim#20460)

Steps to reproduce

When a popup window that has an image is present, moving the cursor is laggy and the cursor flickers or disappears momentarily sometimes.

1. Run this script (the image I used was: PNG image data, 1200 x 1200, 8-bit/color RGBA, non-interlaced

let png = '<some image>'
let dim = split(system('gm identify -format "%w %h" '
            \ .. shellescape(png)))
let [w, h] = [str2nr(dim[0]), str2nr(dim[1])]
call system('gm convert ' .. shellescape(png)
            \ .. ' -depth 8 rgb:/tmp/cat.rgb')
let blob = readblob('/tmp/cat.rgb')
call popup_create('', #{
            \ image: #{ data: blob, width: w, height: h },
            \ line: 1, col: 1, border: [], padding: [0, 0, 0, 0],
            \ })

2. Move the cursor around

Demo:

https://github.com/user-attachments/assets/e7e6f2f3-1c72-4109-999c-99c361a16a28

Expected behaviour

There should be no lag

Version of Vim

9.2.612

Environment

Operating system: Arch Linux, Wayland
Terminal: kitty 0.47.1 created by Kovid Goyal
$TERM: xterm-kitty
Shell:

GNU bash, version 5.3.12(1)-release (x86_64-pc-linux-gnu)
Copyright (C) 2025 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Logs and stack traces

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