[XeTeX] Discretionary line-breaks in Tamil

[Mike Maxwell]

On 9/29/2019 3:02 PM, Suki Venkat wrote:
> Then went on to hack the hyph-ta.texfile and did "mktexfmt xelatex"
> to produce nice results using XeLaTeX.
> It turned out the uni200B was not defined in the font, although uni200C 
> and uni200D were defined.
> Then managed define uni200B in fontforge and it does seem to produce the 
> same result even if the uni200B (ZWSP or DLB) is defined in the font or not.

I'm speaking from ignorance here--I know nothing of the internal 
workings of xetex--but it seems to me that the question of defining a 
glyph for U+200B is beside the point.  It should not, it seems to me, 
have a glyph.  Instead, xetex should break the line or not when it 
encounters this code point, and then--regardless of the line 
break--delete the character.  It's a zero width character, and its 
height is irrelevant (unlike a strut), so there's no shape to show.
-- 
    Mike Maxwell
    "I am, by a flood, borne back to that wondrous
    period, ere time itself can be said to have begun;
    for time began with man." --Herman Melville,
    Moby Dick