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/ProblemView.java
* (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.views.markers.internal.TableView#buildSorter()
	 */
	protected ViewerSorter buildSorter() {
		TableSorter sorter = TableSorter.createTableSorter(getSortingFields());
		sorter.restoreState(getDialogSettings());
		CategorySorter category = new CategorySorter(sorter);
		category.restoreState(getDialogSettings(), this);
		return category;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.views.markers.internal.MarkerView#canBeEditable()
	 */
	boolean canBeEditable() {
		return false;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.views.markers.internal.MarkerView#initToolBar(org.eclipse.jface.action.IToolBarManager)
	 */
	protected void initToolBar(IToolBarManager tbm) {
		tbm.add(getFilterAction());
		tbm.update(false);
	}
}