An additional function that determines whether the extender
is enabled. By default it is considered enabled if the application
active widget is contained in the tracker. If this is also
provided, the criterion is equivalent to
tracker.has(widget) && extender.isEnabled(widget)
A widget tracker for identifying the appropriate extender.
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A base interface for a consumer of one of the menu semantic extension points. The IMenuExtender gives a widget tracker which is checked when the menu is deciding which IMenuExtender to delegate to upon selection of the menu item.