Adds a redirect to the deprecation on HasKeyPreview

reviewed by: ecc



git-svn-id: https://google-web-toolkit.googlecode.com/svn/releases/1.6@4708 8db76d5a-ed1c-0410-87a9-c151d255dfc7
diff --git a/user/src/com/google/gwt/user/client/ui/HasKeyPreview.java b/user/src/com/google/gwt/user/client/ui/HasKeyPreview.java
index 927e865..6b67429 100644
--- a/user/src/com/google/gwt/user/client/ui/HasKeyPreview.java
+++ b/user/src/com/google/gwt/user/client/ui/HasKeyPreview.java
@@ -20,7 +20,9 @@
  * before they are passed to the focused widget.
  * 
  * @see com.google.gwt.event.dom.client.KeyCodeEvent
- * @deprecated This interface has been superseded.
+ * @deprecated This interface is no longer implemented by any GWT library. Use
+ *             {@link com.google.gwt.user.client.Event#addNativePreviewHandler}
+ *             instead.
  */
 @Deprecated
 public interface HasKeyPreview {