Bug 136178 [Markers] Quick filter selection is not updating the view
20050411 Selecting and deselecting filters from the drop down is not changing the filters until you open the dialog
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerView.java
public int getContextChangeMask() {
			return SELECTION;
		}
		public IContext getContext(Object target) {
			String contextId = null;
			
			ConcreteMarker marker = getSelectedConcreteMarker();
			if (marker != null) {
				contextId = IDE.getMarkerHelpRegistry().getHelp(
						marker.getMarker());
			}
			if (contextId == null) {
				contextId = getStaticContextId();
			}
			return HelpSystem.getContext(contextId);
		}
		/**
		 * Return the currently selected concrete marker or
		 * <code>null</code> if there isn't one.
		 * @return ConcreteMarker
		 */
		private ConcreteMarker getSelectedConcreteMarker() {
			IStructuredSelection selection = (IStructuredSelection) getViewer()
					.getSelection();
			if (selection.isEmpty())
				return null;
			if (selection.getFirstElement() instanceof ConcreteMarker)
				return (ConcreteMarker) selection.getFirstElement();
			return null;