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
* @see org.eclipse.ui.views.markers.internal.TableView#sorterChanged()
	 */
	protected void sorterChanged() {
		getViewer().refresh();
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.part.WorkbenchPart#showBusy(boolean)
	 */
	public void showBusy(boolean busy) {
		super.showBusy(busy);
		if (busy) {
			preBusyMarkers = totalMarkers;
		} else {
			if (totalMarkers != preBusyMarkers)
				getProgressService().warnOfContentChange();
		}
	}
	/**
	 * Get the filters that are currently enabled.
	 * 
	 * @return MarkerFilter[]
	 */
	MarkerFilter[] getEnabledFilters() {
		if (enabledFilters == null) {
			Collection filters = findEnabledFilters();
			enabledFilters = new MarkerFilter[filters.size()];
			filters.toArray(enabledFilters);
		}