ill-logic of externals handing with explicit --revision

Dear devs,

It seems that svn (including 1.5) does not propagate explicit command-line
--revision when following svn:external links. Although it makes sense for
distinct repositories, or when explicit revisions are required in the
external link, but there are two cases where a different behavior would
help:
  - if the external link is directly in the *same* repository
  - if the --revision is a date (-r {2008-01-01}).

Otherwise, the usefulness of externals to combine subprojects into one is
greatly reduced. ISTM that explicit command-line --revision should be
forwarded for both cases mentionned above, so as to enable to extract the
related projects as they were at some point in time.

Also, enabling the -r {DATE} syntax in svn:externals properties, with the
above suggested enhancements, would also help for creating simply
related-project multi-repository tags.

-- 
Fabien.
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