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
memento.save(writer);
		} catch (IOException e) {
			IDEWorkbenchPlugin.getDefault().getLog().log(Util.errorStatus(e));
		}
		IDEWorkbenchPlugin.getDefault().getPreferenceStore().putValue(
				getFiltersPreferenceName(), writer.toString());
		IDEWorkbenchPlugin.getDefault().savePluginPreferences();
		clearEnabledFilters();
	}
	/**
	 * Get the name of the filters preference for instances of the receiver.
	 * 
	 * @return String
	 */
	abstract String getFiltersPreferenceName();
	/**
	 * Restore the filters from the mimento.
	 * 
	 * @param memento
	 */
	private void restoreFilters(IMemento memento) {
		IMemento[] sections = null;
		if (memento != null) {
			sections = memento.getChildren(TAG_FILTER_ENTRY);
		}
		if (sections == null) {
			
			IDialogSettings mainSettings = getDialogSettings();
			IDialogSettings filtersSection = mainSettings
					.getSection(OLD_FILTER_SECTION);