Index: /trunk/wp-admin/includes/post.php
===================================================================
--- /trunk/wp-admin/includes/post.php	(revision 16132)
+++ /trunk/wp-admin/includes/post.php	(revision 16133)
@@ -1471,4 +1471,5 @@
 		'paste_remove_spans' => true,
 		'paste_strip_class_attributes' => 'all',
+		'paste_text_use_dialog' => true,
 		'wpeditimage_disable_captions' => $no_captions,
 		'plugins' => $plugins