updated for version 7.4.578
Problem:    Using getcurpos() after "$" in an empty line returns a negative
            number.
Solution:   Don't add one when this would overflow. (Hirohito Higashi)
diff --git a/src/version.c b/src/version.c
index 1367621..7a54fc2 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    578,
+/**/
     577,
 /**/
     576,