Add helper to get combining codepoint from a spacing character
diff --git a/vncviewer/keysym2ucs.h b/vncviewer/keysym2ucs.h
index a09165b..01a7ddb 100644
--- a/vncviewer/keysym2ucs.h
+++ b/vncviewer/keysym2ucs.h
@@ -10,6 +10,8 @@
 unsigned keysym2ucs(unsigned keysym);
 unsigned ucs2keysym(unsigned ucs);
 
+unsigned ucs2combining(unsigned spacing);
+
 #ifdef __cplusplus
 }
 #endif