Sixel support fails in Xterm

[mdp]

Not actually sure if this is an issue with Xterm sixel support, or the detection, but in XTerm I'm getting back a blank line for the sixel version. Need to investigate more.

[mdp]

Looks like it's an issue with detection. Running it with -ti 340 (VT 340) properly support sixel, but the default xterm (VT100 I think) does not, however qrterminal is detecting it as supported.

[lx200916]

That's wired, seems like something wrong with VT communication. Let me check it...