There is an application in which a Panel instance is *Handler for
widgets, which are added dynamically depending on the result returned
by async call. Instances of HandlerRegistration are not maintained by
the application (i.e. values returned by #add*Handler() are not stored
anywhere).

Now lets suppose that one of these widgets is removed from the panel
without calling respective HandlerRegistration#removeHandler(). Will I
have unnecessary references to the panel related to removed widget? Is
it possible that this panel (as a Handler) will be invoked to handle
an event (either native or logical) having removed widget as a source
(either before or after garbage collection)?

GWT 1.7, no JSNI used.

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