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/MarkerSeverityAndDescriptionField.java
return severity2 - severity1;
	}
	/**
	 * Return the image for item.
	 * 
	 * @param item
	 * @return Image or <code>null</code>
	 */
	private Image getImage(MarkerItem item) {
		int severity = -1;
		if (item.getMarker() == null)
			severity = ((MarkerCategory) item).getHighestSeverity();
		else
			severity = getSeverity(item);			
		if (severity >= IMarker.SEVERITY_WARNING)
			return MarkerSupportInternalUtilities.getSeverityImage(severity);
		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)));
	}
}