When moving a directory with some contents, on the target the directory is lost. Let me illustrate with an example:

We have:
<pre>
/a/f
/a/b/ff
</pre>

If I do:
<pre>
$ mkdir c
$ cd a
$ fossil mv * ../c
RENAME a/b/ff c/ff
RENAME a/f c/f
</pre>

So the tree structure is lost. Of course things get worse when ff and f have the same name, as then it results in an error because of the duplication.

Unexpected result moving directories with "fossil mv"