That should depend on whether the files will be moved or not. I will Dekel what should be changed so that nice depends on this property. The solution to this problem is to disable the temporary dir, that explains why I have not seen this behaviour. Of course, this is a temporary fix. Now a little bit of advocacy.
Absolute links are bads.
Suppose that you want to take your work, your tar your directory, as I usually do, with absolute links this is no more possible. The HTML export does not work, i.e. nothing is exported. This should be easy to fix. Dekel has putted some special code to deal with those cases. I will have a look to it.