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
* @param memento
	 */
	public final void restoreState(IMemento memento) {
		resetState();
		restoreFilterSettings(memento);
	}
	/**
	 * Restore the state of the receiver in the supplied settings. This is kept
	 * for backwards compatibility with 3.1 dialog settings.
	 * 
	 * @param settings
	 */
	public void restoreFilterSettings(IDialogSettings settings) {
		resetState();
		String setting = settings.get(TAG_ENABLED);
		if (setting != null) {
			enabled = Boolean.valueOf(setting).booleanValue();
		}
		setting = settings.get(TAG_ON_RESOURCE);
		if (setting != null) {
			try {
				onResource = Integer.parseInt(setting);
			} catch (NumberFormatException eNumberFormat) {
			}
		}
		
		
		setting = settings.get(TAG_SELECTION_STATUS);
		if (setting != null) {
			selectedTypes.clear();