patch 8.1.0586: :digraph output is not easy to read
Problem: :digraph output is not easy to read.
Solution: Add highlighting for :digraphs. (Marcin Szamotulski, closes #3572)
Also add section headers for :digraphs!.
diff --git a/src/proto/digraph.pro b/src/proto/digraph.pro
index 4c12f51..37dc2b2 100644
--- a/src/proto/digraph.pro
+++ b/src/proto/digraph.pro
@@ -4,7 +4,7 @@
int get_digraph(int cmdline);
int getdigraph(int char1, int char2, int meta_char);
void putdigraph(char_u *str);
-void listdigraphs(void);
+void listdigraphs(int use_headers);
char_u *keymap_init(void);
void ex_loadkeymap(exarg_T *eap);
void keymap_clear(garray_T *kmap);