[XeTeX] hyphenation in Ethiopian languages

[Arthur Reutenauer]

> And another nasty issue (that might deserve its own thread). We wanted
> to have no hyphenchar at all, but using \hyphenchar\font=0 has a nasty
> consequence that lines with broken words are not properly justified
> (some extra space is squeezed between the last character in line and
> the non-existent hyphen char).

  Actually, what we've observed is that XeTeX seems to produce a glyph
in the output even if we set \hyphenchar to a character for which there
is no glyph in the current font.  In the attached example, the fourth
line from the end ends in a word that has been hyphenated, and the
trailing white space can actually be copy-pasted from the PDF file and
yields Unicode character U+FFFF (oddly enough).

	Arthur
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