patch 7.4.1669
Problem:    When writing buffer lines to a pipe Vim may block.
Solution:   Avoid blocking, write more lines later.
diff --git a/src/version.c b/src/version.c
index 9ba1375..826ee1d 100644
--- a/src/version.c
+++ b/src/version.c
@@ -749,6 +749,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1669,
+/**/
     1668,
 /**/
     1667,