Success!  With this font, the test case in this bug report works fine:
There are no display glitches when running mutt under term.

But as you can see, this isn't really monospaced, either -- the tofu
glyphs here are narrower than the other glyphs.  And...  hang on --
there's still some glitches, but they are much smaller than before.

I've tried a couple more monospaced fonts, but none seem to have full
coverage.

I'm starting to wonder whether gnome-terminal is just faking the
monospaceness?  That is -- if the glyph is too wide, it's just narrowing
it?

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no