A function to get the kernel for a widget.
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)
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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Interface for a Kernel user to register itself with the IHelpMenu's semantic extension points.