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
* (non-Javadoc)
		 * 
		 * @see org.eclipse.ui.views.markers.internal.DialogMarkerFilter.AbstractNode#getName()
		 */
		public String getName() {
			return type.getLabel();
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.ui.views.markers.internal.DialogMarkerFilter.AbstractNode#isCategory()
		 */
		public boolean isCategory() {
			return false;
		}
		/**
		 * Return the marker type this is wrapping
		 * 
		 * @return Object
		 */
		public Object getMarkerType() {
			return type;
		}
	}
	/**
	 * The MarkerCategory is a data type to represent the categories in the tree
	 * view.
	 * 
	 */
	private class MarkerCategory extends AbstractNode {