svn_client_diff4 and valid relative path throws error even though it shouldn't

Hi,

Just updated to r27993 of the svn trunk. The new param relative_to_dir
in svn_client_diff4() is nice, but it doesn't work in some situations:

a diff between a working copy file and it's base throws an error like this:
Path 'C:\Users\kueng\AppData\Local\Temp/svndiff.tmp' must be an
immediate child of the directory
'D:/Development/SVN/TortoiseSVN/ext/Subversion'

The problem: I didn't specify any temp file path. That path comes from
the fact that the diff first 'translates' the base file (line endings,
maybe keywords, ...), and by doing so creates that temporary file.

I would expect that since it was the svn function itself that created
that temp file, it shouldn't error out but check the original path instead.

To reproduce:
* modify the file subversion\libsvn_subr\config_win.c
* call svn_client_diff4(path, REVWC, path, REVBASE,
'subversion\libsvn_subr', ...)

Stefan

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