I use one-x portal for XMPP. When agent use:
Thick UI
Customer typing: š,đ,č,ć,ž
Agent see: š,ð,è,æ,ž
Agent can type š and ž but when try to type đ,č,ć, it is sent d,c,c.
Thin UI (webUI)
Customer typing: š,đ,č,ć,ž
Agent see: ,ð,è,æ,
Agent type: š,đ,č,ć,ž but it is sent: a, (after this letter...