RFR: Try a bit harder to generate incremental webrevs

[Robin Westberg]

On Thu, 5 Dec 2019 10:38:44 GMT, Erik Helin <ehelin at openjdk.org> wrote:

>> Hi all,
>> 
>> Please review this change that makes the mailing list bridge bot try a little harder to generate an incremental webrev. If a pull request has been rebased or merged the latest changes from the target branch, it may be possible to exclude these and generate a clean incremental webrev. If so, we do that.
>> 
>> Best regards,
>> Robin
> 
> Wow, really nice feature! Looks good, well done!

Thanks for reviewing! Yes, will be interesting to see how often this works in practice!

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PR: https://git.openjdk.java.net/skara/pull/295