patch 7.4.1570
Problem:    There is no way to avoid the message when editing a file.
Solution:   Add the "F" flag to 'shortmess'. (Shougo, closes #686)
diff --git a/src/option.h b/src/option.h
index 6b194bc..460e300 100644
--- a/src/option.h
+++ b/src/option.h
@@ -214,7 +214,8 @@
 #define SHM_INTRO	'I'		/* intro messages */
 #define SHM_COMPLETIONMENU  'c'		/* completion menu messages */
 #define SHM_RECORDING	'q'		/* short recording message */
-#define SHM_ALL		"rmfixlnwaWtToOsAIcq" /* all possible flags for 'shm' */
+#define SHM_FILEINFO	'F'		/* no file info messages */
+#define SHM_ALL		"rmfixlnwaWtToOsAIcqF" /* all possible flags for 'shm' */
 
 /* characters for p_go: */
 #define GO_ASEL		'a'		/* autoselect */