vim-patch:7.4.439 neovim#1245

Problem:  Duplicate message in message history. Some quickfix messages
          appear twice. (Gary Johnson)
Solution: Do not reset keep_msg too early. (Hirohito Higashi)

https://code.google.com/p/vim/source/detail?r=v7-4-439

src/nvim/main.c

@@ -681,10 +681,10 @@ main_loop (
       if (keep_msg != NULL) {
         char_u *p;
 
-        /* msg_attr_keep() will set keep_msg to NULL, must free the
-         * string here. */
+        // msg_attr_keep() will set keep_msg to NULL, must free the string
+        // here. Don't reset keep_msg, msg_attr_keep() uses it to check for
+        // duplicates.
         p = keep_msg;
-        keep_msg = NULL;
         msg_attr(p, keep_msg_attr);
         free(p);
       }

src/nvim/version.c

@@ -193,7 +193,7 @@ static int included_patches[] = {
   //442,
   //441,
   //440,
-  //439,
+  439,
   //438,
   //437,
   436,