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
Object obj = markerTypes.get(i);
			if (obj instanceof MarkerType) {
				Object mapping = nodeToTypeMapping.get(((MarkerType) obj)
						.getId());
				if (mapping != null) {
					typesViewer.setChecked(mapping, true);
					setParentCheckState(mapping, true);
				}
			}
		}
	}
	/**
	 * Updates the enabled state of the widgetry based on whether or not it is
	 * enabled.
	 */
	protected void updateEnabledState(boolean enabled) {
		typesViewer.getTree().setEnabled(enabled);
		selectAllButton.setEnabled(enabled
				&& typesViewer.getTree().getItemCount() > 0);
		deselectAllButton.setEnabled(enabled
				&& typesViewer.getTree().getItemCount() > 0);
		anyResourceButton.setEnabled(enabled);
		anyResourceInSameProjectButton.setEnabled(enabled);
		selectedResourceButton.setEnabled(enabled);
		selectedResourceAndChildrenButton.setEnabled(enabled);
		workingSetGroup.setEnabled(enabled);
	}
	/**
	 * Updates the given filter from the UI state.
	 */