vim-patch:7.4.640

Problem:    After deleting characters in Insert mode such that lines are
            joined undo does not work properly. (issue 324)
Solution:   Use Insstart instead of Insstart_orig. (Christian Brabandt)

c3bbad085c

src/nvim/version.c

@@ -356,7 +356,7 @@ static int included_patches[] = {
   // 643,
   // 642,
   // 641,
-  // 640,
+  640,
   // 639,
   // 638 NA
   637,