This has nothing to do with YATCO, correct. Unselecting fix unnecessary linebreaks on GA servers didn't fix it for me, either
My account here is new so while my post was pending approval I had gone through and checked/unchecked every option in the Mudlet preferences. After a bit I began assuming it was a MUD-specific issue, so I started fiddling around there and found a config in the game itself to enable a telnet GA sequence. Turned that on and voila, no more line break issues. Everything works swimmingly.
since i have already set generic auto-mapper on upper half part of screen, i wanted to set the YATCO window position just under it.
it took a while to figure things out.
needed 2 settings.
1) demonnic.chat.config.location = "bottomright" in config
2) y=-493, line 35, entry 'function demonnic.chat:resetUI()' in YATCO25>Demonic>Tabbed chat>Code
i hope additional use of absolute value in pixel as well for this. (like X = 15 Y = 525 in case topright was start point) and putting all of these basic settings into config.
Edit:
on another mud, it need not setting 2. (forgot to check)
i don't get why YATCO window sits in below GAM's automatically.
YATCO does not support autowrap as it was added after the last major changes were made. EMCO does. That being said YATCO uses the number of chars wide you set as the width of the consoles themselves so I wonder if the chinese characters are causing issues with Geyser's calculating the width due to them being double-width?