I know you wanted to use Windows to do the font-linking process, where mIRC was doing this job in the past, but do you actually think this behavior is ok?
mIRC did not support font-linking in any way before font-linking support was added. The purpose of adding font-linking support in 2006 was to display Unicode characters. The implementation turned out to be incredibly complicated and took several years to refine. mIRC depends entirely on Windows to decide which font to use, so there is no alternative currently. In the future, mIRC may switch to Uniscribe (which has its own issues) or DirectWrite (which is limited to Windows Vista/7 onwards), however this will require a complete rewrite of the display routines.
