[AAT] In InsertionChain, set mark to previous-position if inserting

Fixes MORX-31

1 files changed, 5 insertions, 3 deletions

diff --git a/src/hb-aat-layout-morx-table.hh b/src/hb-aat-layout-morx-table.hh
index a301fd3f..2ebbc351 100644
--- a/src/hb-aat-layout-morx-table.hh
+++ b/src/hb-aat-layout-morx-table.hh
@@ -729,6 +729,8 @@ struct InsertionSubtable
       hb_buffer_t *buffer = driver->buffer;
       unsigned int flags = entry->flags;
 
+      unsigned mark_loc = buffer->out_len;
+
       if (entry->data.markedInsertIndex != 0xFFFF)
       {
 	unsigned int count = (flags & MarkedInsertCount);
@@ -754,6 +756,9 @@ struct InsertionSubtable
 	buffer->unsafe_to_break_from_outbuffer (mark, MIN (buffer->idx + 1, buffer->len));
       }
 
+      if (flags & SetMark)
+	mark = mark_loc;
+
       if (entry->data.currentInsertIndex != 0xFFFF)
       {
 	unsigned int count = (flags & CurrentInsertCount) >> 5;
@@ -791,9 +796,6 @@ struct InsertionSubtable
 	buffer->move_to ((flags & DontAdvance) ? end : end + count);
       }
 
-      if (flags & SetMark)
-	mark = buffer->out_len;
-
       return true;
     }