Bug 137148 [Markers] Contributions to IMarker no longer show up on elements in the Problems View
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()