Bug 167170 [Markers] Need to check for duplicate filter names
M3 It is currently possible to enter duplicate filter names
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/DialogMarkerFilter.java
/**
		 * Get the parent element of the receiver.
		 * 
		 * @return Object
		 */
		public abstract Object getParent();
		/**
		 * Get the name of the receiver.
		 * 
		 * @return String
		 */
		public abstract String getName();
		/**
		 * Return whether or not the receiver has children.
		 * 
		 * @return boolean
		 */
		public abstract boolean hasChildren();
		/**
		 * Get the children of the receiver.
		 * 
		 * @return Object[]
		 */
		public abstract Object[] getChildren();
		/**
		 * Return whether or not this is a category node.
		 * 
		 * @return boolean