vim-patch:7.4.309 #843

Problem:    When increasing the size of the lower window, the upper
            window jumps back to the top. (Ron Aaron)
Solution:   Change setting the topline. (Nobuhiro Takasaki)

https://code.google.com/p/vim/source/detail?r=88a6e9f33822d33b6c32db578750c6c178c63f50

src/nvim/version.c

@@ -248,7 +248,7 @@ static int included_patches[] = {
   //312,
   //311,
   //310,
-  //309,
+  309,
   308,
   //307,
   306,