patch 8.0.0126
Problem:    Display problem with 'foldcolumn' and a wide character.
            (esiegerman)
Solution:   Don't use "extra" but an allocated buffer. (Christian Brabandt,
            closes #1310)
diff --git a/src/Makefile b/src/Makefile
index a24eb7b..dcd59fc 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -2085,6 +2085,7 @@
 	test_delete \
 	test_diffmode \
 	test_digraph \
+	test_display \
 	test_ex_undo \
 	test_execute_func \
 	test_expand \