Bug 89020 [Undo] Operation throws assertion failure if undo limit is set to 0
I20050324-0800 Unfortunately existing clients of text's undo manager were allowed to set any number without failing. This is no longer possible: an assertion failure occurrs if the limit is smaller than 1. I will add code on my side that will handle the negative numbers but the operation history must allow 0.
bundles/org.eclipse.core.commands/src/org/eclipse/core/commands/operations/DefaultOperationHistory.java
}
		}
		
		
		if (status.isOK()) {
			redoList.remove(operation);
			
			 
			
			
			 
			
			if (operation.canUndo()) {
				checkUndoLimit(operation);
				undoList.add(operation);
			}
			
			notifyRedone(operation);
		} else {
			notifyNotOK(operation);
			if (flushOnError && status.getSeverity() == IStatus.ERROR) {
				remove(operation);
			}
		}
		return status;
	}
	/**
	 * Perform the undo. All validity checks have already occurred.
	 * 
	 * @param monitor