Image preview does not work with tmux popup

[playbahn]

Checklist

• [x] I have read through the manual page (man fzf)
• [x] I have searched through the existing issues
• [x] For bug reports, I have checked if the bug is reproducible in the latest version of fzf

Output of fzf --version

0.65.0 (04c4269d)

OS

• [x] Linux
• [ ] macOS
• [ ] Windows
• [ ] Etc.

Shell

• [x] bash
• [ ] zsh
• [ ] fish

Problem / Steps to reproduce

Set:

FZF_DEFAULT_OPTS="
    --multi
    --highlight-line
    --height            50%
    --tmux              80%
    --layout            reverse
    --border            sharp
    --info              inline-right
    --preview           '$HOME/oss/fzf/bin/fzf-preview.sh {}'
    --preview-border    line
    --tabstop           4"

Open fzf while inside tmux, select any image. (I'm using Konsole, it has builtin sixel support)

[junegunn]

Last time I checked, tmux popup didn't support images.

https://github.com/tmux/tmux/issues/4329