vim-patch:7.4.315 #1021

Problem:    Fixes for computation of topline not tested.
Solution:   Add test. (Hirohito Higashi)

https://code.google.com/p/vim/source/detail?r=646616b6ff4defcc7bef0b198b540f6d965a8126

src/nvim/version.c

@@ -242,7 +242,7 @@ static int included_patches[] = {
   //318,
   //317,
   //316,
-  //315,
+  315,
   //314,
   //313,
   //312,