Created attachment 2688 [details] paint visual host key with unicode box-drawing characters Paint visual host key with unicode box-drawing characters. This is completly optional and should not break anything if the system does not support it.
I'm not sure we want the extra complexity needed to do this; ASCII art is simple and works everywhere. That being said, we definitely don't want to do it via iconv - that's overkill.
Feel free to close with WONTFIX. Initially this was just a proof of concept and I learned a lot. But this brings no real benefit but complexity. Even if not used this requires strings (pointer to char) instead of plain characters to handle the multi byte characters. At least it is archived here for everybody interested in this.