Re: GNU Emacs Unicode support

[Otfried Cheong <otfried@xxxxxxxxx>]

 > > Second, I find the behaviour of "wcwidth" for the conjoining Johab
 > > range irrational.  It doesn't make any sense to make the leading
 > > consonant full-width, with vowels and finals being half-width. I don't
 > > want to have to split my glyphs over two fonts to see the Johab
 > > elements on software that doesn't support conjoining.  (On a
 > > conjoining renderer the result of conjoining should of course be
 > > full-width.)
 > 
 > What do you mean by "conjoining Johab range"?
 > 
 > I was under the impression that when decomposing a Hangul syllable,
 > the result were a consonant, vowel and final, all three in the range
 > U+3131..U+318E - which are marked as "wide" in EastAsianWidth.txt.

The range U+3131..U+318e exists for compatibility with KSC5601 only.
These characters are ordinary letters, with no special combining
behaviour, and they are all full-width.

I was referring to the range U+1100 to U+11f9, the conjoining Jamo.
There is really no direct mapping of these elements to glyphs, as a
conjoining renderer would have to assemble a choseong, jungseong, and
(perhaps) a jongseong into a single full-width glyph (and the Unicode
standard defines this mapping for the characters in the Hangul block
U+ac00..U+d7a3).

However, when working with text containing syllables composed of Jamo
on software that does not (yet) support conjoining, I would like to be
able to see some representation of these elements.  It doesn't make
sense that the representation for choseong is full-width, while the
jungseong and jongseong are half-width. (Even though
EastAsianWidth-3.txt seems to indicate this.)

Otfried


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