Bug 94459 [Undo] - should refactoring undo work when text undo limit is 0?
Refactoring undos are not showing up in the package explorer undo menu when the text undo limit is set to 0. Technically the refactoring operation should be permitted on the workspace undo context history. The history should just be removing the text context from the operation. One could argue this is a correctly working "feature" but need to check why it's happening and resolve the behavior as a bug or document as expected outcome.
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/operations/DefaultOperationHistory.java
* disposed. This flag should be used for debug purposes only.
	 */
	public static boolean DEBUG_OPERATION_HISTORY_DISPOSE = false;
	/**
	 * This flag can be set to <code>true</code> if the history should print
	 * information to <code>System.out</code> during the open/close sequence.
	 * This flag should be used for debug purposes only.
	 */
	public static boolean DEBUG_OPERATION_HISTORY_OPENOPERATION = false;
	/**
	 * This flag can be set to <code>true</code> if the history should print
	 * information to <code>System.out</code> whenever an operation is not
	 * approved. This flag should be used for debug purposes only.
	 */
	public static boolean DEBUG_OPERATION_HISTORY_APPROVAL = false;
	static final int DEFAULT_LIMIT = 20;
	/**
	 * the list of {@link IOperationApprover}s
	 */
	List approvers = Collections.synchronizedList(new ArrayList());
	/**
	 * a map of undo limits per context
	 */
	private Map limits = Collections.synchronizedMap(new HashMap());
	/**
	 * the list of {@link IOperationHistoryListener}s
	 */
	List listeners = Collections.synchronizedList(new ArrayList());
	/**
	 * the list of operations available for redo, LIFO