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/MarkerView.java
*/
			public void propertyChange(PropertyChangeEvent event) {
				if (event.getProperty().equals(getFiltersPreferenceName())) {
					loadFiltersPreferences();
					clearEnabledFilters();
					refreshForFocusUpdate();
				}
			}
		};
		IDEWorkbenchPlugin.getDefault().getPreferenceStore()
				.addPropertyChangeListener(preferenceListener);
	}
	/**
	 * Get the current markers for the receiver.
	 * 
	 * @return MarkerList
	 */
	public MarkerList getCurrentMarkers() {
		return getMarkerAdapter().getCurrentMarkers();
	}
	/**
	 * Get the marker adapter for the receiver.
	 * 
	 * @return MarkerAdapter
	 */
	protected MarkerAdapter getMarkerAdapter() {
		return adapter;
	}
	/**
	 * Update for the change in the contents.