server diffs and svn diff -rREV1:REV2

Hello

I have a fix for 'svn diff -rREV1:REV2' that copes with the new diffs
sent over ra_dav. It all works :-) except it breaks ra_local :-(

Consider a file at REV3 in the working copy. When asking for a REV1 to
REV2 diff, then it appears that ra_dav sends a diff that will
construct REV2 from REV3, but ra_local sends a diff that will
construct REV2 from REV1. [When using ra_dav the the
svn_ra_callbacks_t get_wc_prop function is invoked to determine the
working copy revision. This doesn't happen over ra_local.]

Am I right in thinking that ra_local sends diffs differently from
ra_dav?

Now I know how to cause ra_dav to mimic the ra_local behaviour, but
that is effectively disabling an ra_dav feature. It would also make
some of my new code redundant, which seems like a waste.

There doesn't seem to be a way within the editor to determine which
file is the baseline for the diff, I just have to know. Is passing an
ra_dav/ra_local flag into the function that creates the editor the
best way to do this?

-- 
Philip
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