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
/*
		 * If we are in the middle of an open batch, then we will add this
		 * operation's contexts to the open operation rather than add the
		 * operation to the history. We will still execute it, but will dispose
		 * of it afterward. Operations triggered during an operation are assumed
		 * to be model-related and we assume the undo of this related operation
		 * will be triggered automatically by the undo of the batching
		 * operation.
		 */
		boolean merging = false;
		if (openComposite != null) {
			
			
			if (openComposite == operation) {
				return IOperationHistory.OPERATION_INVALID_STATUS;
			}
			openComposite.add(operation);
			merging = true;
		}
		/*
		 * Execute the operation
		 */
		if (!merging)
			notifyAboutToExecute(operation);
		IStatus status;
		try {
			status = operation.execute(monitor, info);
		} catch (OperationCanceledException e) {
			status = Status.CANCEL_STATUS;
		} catch (ExecutionException e) {