Index: third_party/harfbuzz-ng/src/hb-ot-shape-complex-thai.cc |
diff --git a/third_party/harfbuzz-ng/src/hb-ot-shape-complex-thai.cc b/third_party/harfbuzz-ng/src/hb-ot-shape-complex-thai.cc |
index feb7fc7a148af398692d3fcb56b8f0c8b3bb0aca..d4ede209f4b39a6248cd0ccda7417f9e7d690ff0 100644 |
--- a/third_party/harfbuzz-ng/src/hb-ot-shape-complex-thai.cc |
+++ b/third_party/harfbuzz-ng/src/hb-ot-shape-complex-thai.cc |
@@ -353,7 +353,7 @@ preprocess_text_thai (const hb_ot_shape_plan_t *plan, |
{ |
/* Since we decomposed, and NIKHAHIT is combining, merge clusters with the |
* previous cluster. */ |
- if (start) |
+ if (start && buffer->cluster_level == HB_BUFFER_CLUSTER_LEVEL_MONOTONE_GRAPHEMES) |
buffer->merge_out_clusters (start - 1, end); |
} |
} |