Bug 67726 Refactoring fails if validate edit returns a cancel status [refactoring]
org.eclipse.ltk.core.refactoring/src/org/eclipse/ltk/core/refactoring/RefactoringStatus.java
* Returns whether the status's severity is <code>OK</code> or not. 
	 * 
	 * @return <code>true</code> if the severity is <code>OK</code>; 
	 *  otherwise <code>false</code> is returned
	 */
	public boolean isOK() {
		return fSeverity == OK;
	}
	/**
	 * Returns <code>true</code> if the current severity is <code>
	 * FATAL</code>.
	 * 
	 * @return <code>true</code> if the current severity is <code>
	 *  FATAL</code>; otherwise <code>false</code> is returned
	 */
	public boolean hasFatalError() {
		return fSeverity == FATAL;
	}
	/**
	 * Returns <code>true</code> if the current severity is <code>
	 * FATAL</code> or <code>ERROR</code>.
	 * 
	 * @return <code>true</code> if the current severity is <code>
	 *  FATAL</code> or <code>ERROR</code>; otherwise <code>false
	 *  </code> is returned
	 */
	public boolean hasError() {
		return fSeverity == FATAL || fSeverity == ERROR;
	}
	/**