Event preview inconsistency for Buttons triggered with ENTER / SPACE ?

I have an event preview handler that listens for KeyUpEvents and checks for ENTER and SPACE. I also have an ordinary GWT button with a ClickHandler. When triggering the GWT button using the keyboard the following happens

1.) Button focused and triggered via ENTER

=> ClickEvent triggered

=> Native Event preview handler triggered

2.) Button focused and triggered via SPACE

=> Native Event preview handler triggered

=> ClickEvent triggered

So the question is why does ENTER cause the event preview to be triggered after the button has triggered? I would expect it to always work like in 2) as it is an event preview handler.

Is this a possible GWT bug or just how browsers work? Tested it on FF and Chrome. Can anyone explain this to me?

-- J.

--
You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group.
To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit+unsubscribe@googlegroups.com.
To post to this group, send email to google-web-toolkit@googlegroups.com.
Visit this group at http://groups.google.com/group/google-web-toolkit.
For more options, visit https://groups.google.com/groups/opt_out.