Bug 123319 [Markers] ClassCastException during marker update
3.2 20050116 It is possible to get the following ClassCastException during marker updates. This is because the refreshes are not IMarkers and should not be processed. !ENTRY org.eclipse.core.jobs 4 2 2006-01-10 16:00:48.468 !MESSAGE An internal error occurred during: "Process resource updates". !STACK 0 java.lang.ClassCastException at org.eclipse.ui.views.markers.internal.MarkerView$MarkerProcessJob.getExistingMarkers(MarkerView.java:206) at org.eclipse.ui.views.markers.internal.MarkerView$MarkerProcessJob.run(MarkerView.java:169) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:58)
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerView.java
*/
		private Collection getAddedMarkers(Collection addedMarkers) {
			if (addedMarkers.isEmpty())
				return Util.EMPTY_COLLECTION;
			List toAdd = new ArrayList();
			Iterator added = addedMarkers.iterator();
			MarkerFilter[] filters = getEnabledFilters();
			while (added.hasNext()) {
				ConcreteMarker newMarker;
				try {
					newMarker = MarkerList.createMarker((IMarker) added.next());
					for (int i = 0; i < filters.length; i++) {
						if (filters[i].select(newMarker))
							toAdd.add(newMarker);
					}
				} catch (CoreException e) {
					IDEWorkbenchPlugin.getDefault().getLog().log(e.getStatus());
				}
			}
			return toAdd;
		}
		/**
		 * Refresh all of the contents of changed.
		 * 
		 * @param changed
		 *            Collection of ConcreteMarker
		 */
		public void refresh(Collection changed) {
			synchronized (updateKey) {
				refreshes.addAll(changed);