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
protected IWorkingSet workingSet;
	protected int onResource;
	protected boolean enabled;
	private IResource[] focusResource;
	private Set cachedWorkingSet;
	
	private String name;
	/**
	 * Create a new instance of the receiver.
	 * 
	 * @param filterName
	 *            The human readable name for the filter
	 * @param rootTypes
	 *            The types this filter will be applied to
	 */
	MarkerFilter(String filterName, String[] rootTypes) {
		name = filterName;
		for (int i = 0; i < rootTypes.length; i++) {
			MarkerType type = MarkerTypesModel.getInstance().getType(rootTypes[i]);
			if (!this.rootTypes.contains(type)) {
				this.rootTypes.add(type);
			}
		}
		resetState();
	}
	/**
	 * List all types known to this MarkerFilter.
	 * 
	 * @param types
	 *            list to be filled in with types