How to verify if tmux are compiled with sixel support?

[realyukii]

Issue description

I tried to display an image from ssh connection, but it shows only + symbol

[user@server ~]$ img2sixel cat.jpeg
SIXEL IMAGE (108x43)++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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I see that tmux support sixel on this site, but I'm not sure if my tmux was compiled with the --enable-sixel flag, since I install it through arch repository.

Required information

Please provide the following information:

• tmux version (tmux -V).
• Platform (uname -sp).
• $TERM inside and outside of tmux (echo $TERM).
• Logs from tmux (tmux kill-server; tmux -vv new).

[user@server ~]$ tmux -V
tmux 3.4
[user@server ~]$ uname -sp
Linux unknown
[user@server ~]$ echo $TERM
tmux-256color

tmux kill-server; tmux -vv new did provide any output.

EDIT: I have another question, but I'll just link it here

[nicm]

Send DA and see if it responds with capability 4.

[realyukii]

What do you mean by "DA"?

[nicm]

printf "\033[c";cat

[realyukii]

it responds:

$ printf "\033[c";cat
^[[?1;2;4c

what does it mean?

[nicm]

The 4 means SIXEL is supported by this build.

[github-actions]

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