[Bug] propset svn:externals with the new 1.6 syntax does not honor the revision first.

Dear Developers,

We have encountered a problem on using external repo with the new syntax
introduced on version 1.5.

For a target path no longer exists on the head revision, the
svn:external fails with the new syntax. e.g.

> svn rename foo bar
    A bar
    D foo
>svn commit -m "renamed foo to bar"
    Adding bar

    Committed revision 100.
>cd ../baz
    #### new syntax ####
>svn propset svn:externals -r 90 ^/path/to/foo foo
>svn update
    A ~/svnrepo/baz/foo
    svn: external failed (details below):
    svn: URL '/svn/shared/!svn/bc/100/path/to/foo' path not found
    #### old syntax ####
>svn propset svn:externals foo -r 90 ^/path/to/foo
>svn update
    A ~/svn/repo/baz/foo - at revision: 90
    Updated to revision 100.

The bug exists since svn 1.5 and it is still there in version 1.6.6.

-- 
Regards,
*Janus Ng*
System Analyst
Technical Department
Asia Vision Technology Ltd.
Tel: (852) 2319 2648 ext: 283   Fax: (852) 2319 2665
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