Bug 219483 [Markers] MarkerField needs to support font and colours
Some users want to be able to set the font and colour of an entry in the markers view. We should pass in a ViewerCell for this.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/MarkerProblemSeverityAndMessageField.java
/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.provisional.views.markers.IMarkerField#compare(org.eclipse.ui.provisional.views.markers.MarkerItem,
	 *      org.eclipse.ui.provisional.views.markers.MarkerItem)
	 */
	public int compare(MarkerItem item1, MarkerItem item2) {
		int severity1 = getSeverity(item1);
		int severity2 = getSeverity(item2);
		if (severity1 == severity2)
			return super.compare(item1, item2);
		return severity2 - severity1;