patch 7.4.1699
Problem:    :packadd does not work the same when used early or late.
Solution:   Always load plugins matching "plugin/**/*.vim".
diff --git a/src/ex_cmds2.c b/src/ex_cmds2.c
index c03c240..9f74376 100644
--- a/src/ex_cmds2.c
+++ b/src/ex_cmds2.c
@@ -3376,7 +3376,7 @@
 
     if (load_files)
     {
-	static char *plugpat = "%s/plugin/*.vim";
+	static char *plugpat = "%s/plugin/**/*.vim";
 	static char *ftpat = "%s/ftdetect/*.vim";
 	int	    len;
 	char_u	    *pat;