vim-patch:7.4.645

Problem:    When splitting the window in a BufAdd autocommand while still in
            the first, empty buffer the window count is wrong.
Solution:   Do not reset b_nwindows to zero and don't increment it.

8da9bbfd02

src/nvim/version.c

@@ -351,7 +351,7 @@ static int included_patches[] = {
   // 648 NA
   // 647 NA
   646,
-  // 645,
+  645,
   // 644 NA
   // 643,
   // 642,