Bug 58542 Dangerous change to setSystem in MarkersViews
In MarkerView.refresh() there is the line uiJob.setSystem(true); Which may happen after the uiJob has run. As a result it is possible that it is not being used to decrement the count of jobs and the progress monitor can run forever.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerView.java
* attribute of this marker.  In other cases (more than one marker
	 * is selected) the status area indicates how many items have
	 * been selected.
	 * <p>
	 * This method may be overwritten.
	 * </p><p>
	 * This method is called whenever a selection changes in this view.
	 * </p>
	 * @param selection a valid selection or <code>null</code>
	 */
	protected void updateStatusMessage(IStructuredSelection selection) {
		String message = ""; 
		
		if (selection == null || selection.size() == 0){
			
			message = updateSummaryVisible();
		} else if (selection.size() == 1) {
			
			ConcreteMarker marker = (ConcreteMarker)selection.getFirstElement();
			message = marker.getDescription(); 
		} else if (selection.size() > 1) {
			
			message = updateSummarySelected(selection);
		}
		getViewSite().getActionBars().getStatusLineManager().setMessage(message);		
	}
	/**
	 * @param selection
	 * @return the summary status message
	 */