WICKET-6514 and FeedbackPanel

[Andrea Del Bene]

Hi,

as a result of WICKET-6514 now FeedbackPanel doesn't show anymore 
session messages. I'm not sure if this was intentional, but I think  
FeedbackPanel shouldn't change its behavior. Should we modify 
FeedbackPanel to restore the original behavior?

PS: I've noted this change with FeedbackPanel because now a wicketstuff 
test fails 
(org.wicketstuff.minis.component.DefaultInvisibleFeedbackPanelTest.testVisibility).

Andrea.