Made changes to add_header_left.
Change the name of attr original_kable_meta to kable_meta
diff --git a/R/group_rows.R b/R/group_rows.R
index 2df22ca..7b2ad33 100644
--- a/R/group_rows.R
+++ b/R/group_rows.R
@@ -98,7 +98,8 @@
     )
   }
   out <- sub(rowtext, new_rowtext, out)
-  attr(out, "original_kable_meta") <- table_info
+  table_info$group_rows_used <- TRUE
+  attr(out, "kable_meta") <- table_info
   out <- add_indent(out, seq(start_row, end_row))
   return(out)
 }