bug#7284: strnxfrm returns different results for equal strings

mysql-test/include/ctype_filesort.inc

@@ -0,0 +1,15 @@
+#
+# Set desired charset_connection and collation_collation
+# before including this file.
+#
+
+# The next query creates a LONGTEXT column
+# using the current character_set_connection
+# and collation_connection.
+
+create table t1 select repeat('a',4000) a;
+delete from t1;
+
+insert into t1 values ('a'), ('a '), ('a\t');
+select collation(a),hex(a) from t1 order by a;
+drop table t1;