Bug 215985 [Markers] Description column not sorting text
Currently the description column in the problems view is sorting by severity but not comparing Strings of equal severity.
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/views/markers/MarkerEntry.java
String value;
		if (attributeCache.containsKey(attribute)) {
			Object cached = attributeCache.get(attribute);
			if (cached == null)
				return defaultValue;
			value = (String) cached;
		} else {
			value = marker.getAttribute(attribute, defaultValue);
			attributeCache.put(attribute, value);
		}
		return value;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.provisional.views.markers.MarkerItem#getChildren()
	 */
	public MarkerItem[] getChildren() {
		return MarkerSupportInternalUtilities.EMPTY_MARKER_ITEM_ARRAY;
	}
	/**
	 * Get the CollationKey for the string attribute.
	 * 
	 * @param attribute
	 * @param defaultValue
	 *            the defaultValue if the value is not set
	 * @return CollationKey
	 */
	public CollationKey getCollationKey(String attribute, String defaultValue) {
		if (collationKeys.containsKey(attribute))