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
* (non-Javadoc)
		 * 
		 * @see org.eclipse.ui.progress.WorkbenchJob#shouldRun()
		 */
		public boolean shouldRun() {
			return PlatformUI.isWorkbenchRunning();
		}
		/*
		 * (non-Javadoc)
		 * 
		 * @see org.eclipse.core.runtime.jobs.Job#belongsTo(java.lang.Object)
		 */
		public boolean belongsTo(Object family) {
			return MARKER_UPDATE_FAMILY == family;
		}
	}
	MarkerProcessJob markerProcessJob = new MarkerProcessJob();
	private class UpdateJob extends WorkbenchJob {
		private class MarkerDescriptor {
			String description;
			String folder;
			String resource;
			int line;
			MarkerDescriptor(ConcreteMarker marker) {
				description = marker.getDescription();
				folder = marker.getFolder();
				resource = marker.getResourceName();
				line = marker.getLine();
			}
			boolean isEquivalentTo(ConcreteMarker marker) {