[Minor] Add Activity.remove(String) to remove an element
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@ -179,7 +179,10 @@ public class Activity extends GroupedParameterizedElement
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* @return the removed element, or null if it does not exist
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*/
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public IActivityElement remove(String id) {
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return this.elements.remove(id);
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IActivityElement element = this.elements.remove(id);
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if (element != null)
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element.setParent(null);
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return element;
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}
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/**
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