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/MarkerComparator.java
value = fields[i].compare(item0, item1);
			if (value == 0)
				continue;
			return value;
		}
		return 0;
	}
	/**
	 * Switch the priority of the field from ascending to descending or vice
	 * versa.
	 * 
	 * @param field
	 */
	public void reversePriority(MarkerField field) {
		if (descendingFields.remove(field))
			return;
		descendingFields.add(field);
	}
	/**
	 * Set field to be the first sort field.
	 * 
	 * @param field
	 */
	void setPrimarySortField(MarkerField field) {
		if (fields[0] == field) {
			reversePriority(field);
			return;
		}
		int insertionIndex = 1;
		MarkerField[] newFields = new MarkerField[fields.length];