Bug 127629 [Markers] problems view: keep selection stable
I20050214-0010 1. Select a grouping (e.g. Java problem type) and select a marker inside 2. Switch to another grouping Selection is gone. Same when - changing filter - a build adds new marker (in a different file)
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);
	}
	/**
	 * Select the category for the receiver.