Comment 3 for bug 746289

Sorry, I was indeed a bit too quick to mark this as a dupe of that other bug.

To be able to expand $Revision-Id$ here we're looking at the text revision in the inventory, which is not set for preview trees. On the other hand, we can't use the Tree itself for this as the Tree interface doesn't have a way to retrieve the last changed revision. Perhaps it's time to extend it to do so ?