commit https://github.com/vim/vim/commit/86edef664efccbfe685906c854b9cdd04e56f2d5 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Mar 13 18:07:30 2016 +0100 patch 7.4.1557 Problem: Windows cannot be identified. Solution: Add a unique window number to each window and functions to use it.

--- a/src/version.c
+++ b/src/version.c
@@ -744,6 +744,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1557,
+/**/
     1556,
 /**/
     1555,