updated for version 7.3.963

Problem:    Setting curbuf without curwin causes trouble.
Solution:   Add switch_buffer() and restore_buffer().  Block autocommands to
            avoid trouble.

src/version.c

@@ -728,6 +728,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    963,
 /**/
     962,
 /**/