Fix tag value parsing

If a tag is more than 2 characters from the beginning of the comment the
tag value offset will be wrong. #1702 gives an example where the tag
line starts with `;;` and the tag value thus becomes `: Bar` because of
this bug.

The use `index` in the offset calulation seems to be a lucky coincidence
that works in the common case: "; tag: value"

Fixes #1702

1 files changed, 1 insertions, 1 deletions

diff --git a/src/item.cc b/src/item.cc
index 7132103e..d46fba8b 100644
--- a/src/item.cc
+++ b/src/item.cc
@@ -198,7 +198,7 @@ void item_t::parse_tags(const char * p,
       tag = string(q, len - index);
 
       string_map::iterator i;
-      string field(p + len + index);
+      string field(p + (q - buf.get()) + len);
       trim(field);
       if (by_value) {
         bind_scope_t bound_scope(scope, *this);