[XeTeX] Discretionary line-breaks in Tamil

[Suki Venkat]

Hi,

There is a unicode character at 200B that is used for discretionary
line-breaks (DLB) quite in the spirit of discretionary hyphens. In Tamil
words broken at the end of a line are not hyphenated (as it is  agglutinate
language and is not a isolating language like English).
Some editors like Emacs and InDesign do not allow cursor to move freely
between characters, so I worked out a solution by putting these DLBs after
every half consonants, which seems to be a nice solution to the hyphenation
problem as well (but this may not be sufficient).

Wondering if XeTeX care about DLBs (they are useful to break long URLs and
stuff like that).

Suki
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