Diff doesn't work with single file externals?

I just tried out single file externals for the first time, using
TortoiseSVN 1.8.1. I created a new directory in my repo, set up the
externals property to pull in some existing source files, and checked out a
working copy of the directory. It got populated with the files, just as I
expected. I then modified some of the files, which caused their icons to
change in Windows Explorer; so far so good.
I then did an SVN diff and it showed the working base as a _blank_ file on
the left, my edited file on the right. I think it should have instead
shown the original (non-blank) file on the left. I tried to get the
desired diff display another way by starting a commit, then double-clicking
on the changed files in the list, but got the same result.

However, when I created a patch file, it correctly showed only the lines I
edited. So I think it has all of the correct information, but has trouble
finding the working base copy when setting up the diff view. Any idea how
to fix that?

I tried it with the diff viewer set to WinMerge then TortoiseMerge with the
same results. If I set up a working copy with a directory included through
an svn:externals property, the diff view works fine there. So the problem
seems to be related to doing single file externals.

Steve

-- 
Steve Strobel
Link Communications, Inc.
1035 Cerise Rd
Billings, MT 59101-7378
(406) 245-5002 ext 102
(406) 245-4889 (fax)
WWW: http://www.link-comm.com
MailTo:steve.strobel_at_link-comm.com
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