font for jit chars?

[Ilya N. Golubev]

So, now `specifier-matching-instance' MATCHSPEC `car' must be
`(get-charset 'jit-ucs-charset-0)', and this does make difference with
just `'jit-ucs-charset-0'?  If so, please document.

If all of it should not make difference, then my tools, `xfontsel',
`xfd', show wrong things, or at least fail to reproduce how xemacs
uses this font.  And should normally use them to select the font.  So
in this case will need at least an item in `PROBLEMS' describing how
to figure that X tools are broken this way, and what to use instead.

Is `encode-as-utf-8' in font specifier TAG-SET essential?  If so,
please document.