[HarfBuzz] harfbuzz: Branch 'master'

[Behdad Esfahbod]

 src/hb-common.cc |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

New commits:
commit 39607dc98e433ef577c1de0f309ce40fc40529be
Author: Martin Hosken <martin_hosken at sil.org>
Date:   Thu Aug 9 15:16:32 2018 +0700

    Support _ in feature ids

diff --git a/src/hb-common.cc b/src/hb-common.cc
index a02d325a..6d12c097 100644
--- a/src/hb-common.cc
+++ b/src/hb-common.cc
@@ -847,7 +847,7 @@ parse_tag (const char **pp, const char *end, hb_tag_t *tag)
   }
 
   const char *p = *pp;
-  while (*pp < end && ISALNUM(**pp))
+  while (*pp < end && (ISALNUM(**pp) || **pp == '_'))
     (*pp)++;
 
   if (p == *pp || *pp - p > 4)