Bug 127289 [Markers] SystemFilter and group selection state not preserved
We are not preserving the selection state of the system filters or which group is selected.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerFilter.java
setting = settings.get(TAG_SELECTED_TYPES);
			if (setting != null) {
				generateSelectedTypes(setting);
			}
		}
		setting = settings.get(TAG_WORKING_SET);
		if (setting != null) {
			setWorkingSet(PlatformUI.getWorkbench().getWorkingSetManager()
					.getWorkingSet(setting));
		}
	}
	/**
	 * Set the selected types based on the value.
	 * 
	 * @param selectedTypesValue
	 */
	void generateSelectedTypes(String selectedTypesValue) {
		selectedTypes.clear();
		StringTokenizer stringTokenizer = new StringTokenizer(
				selectedTypesValue);
		while (stringTokenizer.hasMoreTokens()) {
			MarkerType markerType = getMarkerType(stringTokenizer
					.nextToken(TAG_TYPES_DELIMITER));
			if (markerType != null && !selectedTypes.contains(markerType)) {
				selectedTypes.add(markerType);
			}
		}
	}
	/**
	 * Find the markerType matching typeName