[subset] keep features that have FeatureParams and the tag is "size"
diff --git a/src/hb-ot-layout-gsubgpos.hh b/src/hb-ot-layout-gsubgpos.hh
index aa5d496..8a01575 100644
--- a/src/hb-ot-layout-gsubgpos.hh
+++ b/src/hb-ot-layout-gsubgpos.hh
@@ -3783,8 +3783,12 @@
// http://lists.freedesktop.org/archives/harfbuzz/2012-November/002660.html
continue;
- if (f.featureParams.is_null ()
- && !f.intersects_lookup_indexes (lookup_indices)
+
+ if (!f.featureParams.is_null () &&
+ tag == HB_TAG ('s', 'i', 'z', 'e'))
+ continue;
+
+ if (!f.intersects_lookup_indexes (lookup_indices)
#ifndef HB_NO_VAR
&& !alternate_feature_indices.has (i)
#endif
