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Subject: Re: MML charset tag regression
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Simon Josefsson <jas@extundo.com> writes:

> I reached exactly the same conclusion.  Still, I think Emacs should be
> able to recover.  I assume emacs is able to distinguish between empty
> boxes and real characters

I don't think Emacs is able to distinguish, see this entry from TODO:

* Implement Lisp functions to determine properly whether a character
  is displayable (particularly needed in XFree 4, sigh).  Use it to
  define useful glyphs that may be displayed as images or unicodes
  (with ASCIIfied fallback via latin1-disp).  Examples include
  box-drawing graphics in Custom buffers, W3 rules and tables, and
  tree displays generally, mode-line mail indicator.  [See work done
  already for Emacs 22 and consult fx.]