On 30/4/13 21:49, Behdad Esfahbod wrote:
On 13-04-28 05:27 PM, Georg Duffner wrote:
Hi,
I posted this on the XeTeX list. Khaled meant it could have something to do
with
http://cgit.freedesktop.org/harfbuzz/commit/?id=607feb7cff0e50f8738d2e49ca463fc9d7d494de
Recently I’ve changed the behaviour of liga. The f-ligatures are now formed by
component glyphs which get substituted by means of contextual chaining
lookups. Thus, instead of
sub f f by f_f; the lookup is now sub f' f by f._f;
What you should be doing is:
sub f' f' by f._f f;
Not sure if the format supports that. However, I understand that this would
cause a problem in that every other f won't be substituted.
We really do want to ignore ZWNJ in backtrack/lookahead. The problem is that
you are abusing those contexts to do a ligation using single substitutions.
Jonathan, do you have any suggestions?
Presumably, the way to handle this as a font developer is to explicitly
handle the ZWNJ, by adding something like
sub f' zwnj f by f;
ahead of the existing rule. That should in effect block the "ligature"
when ZWNJ is present, if I'm understanding correctly.
JK
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