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Karthik Krishnan authored
ENH: 1. Deep copy methods on the handles, so that the seed widget can function as a container of handles with heterogenous properties. 2. When invoking interaction event on the seed widget, also pass the seed index as call data, as a convenience to the user. 3. Test (2) above. 4. (BUG) Do not invoke interaction event every time we move the mouse. Only invoke it if we are near a seed.
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