Performs hit-testing on this AnnObject.
The LeadPointD to be tested.
Threshold buffer value, in container units.
true if the test point intersects with the object; otherwise, false.
hitTestBuffer is used to make the test point "bigger" to compensate for errors and provide smoother hit-testing. For example, if buffer is 2, a square with a length of 4 units around the test point will be used to perform the hit-testing.
By default, an annotation object will return true if hit-testing was satisfied. Derived objects can override this method to fine tune the return value.
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