Bug 221521 [Markers] New markers API needs to be pared down
We have too much API in some of the new classes and they can be moved to internals
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/MarkerProblemSeverityAndMessageField.java
if (supportItem.isConcrete())
			severity = getSeverity(item);
		else
			severity = ((MarkerCategory) supportItem).getHighestSeverity();
		if (severity >= 0)
			return MarkerSupportInternalUtilities.getSeverityImage(severity);
		try {
			if (supportItem.isConcrete())
				return null;
			return JFaceResources
					.getResources()
					.createImageWithDefault(
							IDEInternalWorkbenchImages
									.getImageDescriptor(IDEInternalWorkbenchImages.IMG_ETOOL_PROBLEM_CATEGORY));
		} catch (DeviceResourceException e) {
			return null;
		}
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.views.markers.MarkerField#update(org.eclipse.jface.viewers.ViewerCell)
	 */
	public void update(ViewerCell cell) {
		super.update(cell);
		MarkerItem item = (MarkerItem) cell.getElement();
		cell.setImage(annotateImage(item, getImage(item)));
	}
}