RFR: 1133: Source branch for /backport PRs is outdated [v2]

[Magnus Ihse Bursie]

On Tue, 24 Aug 2021 18:07:18 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> As mentioned in the JBS bug report for this bug, [SKARA-1080](https://bugs.openjdk.java.net/browse/SKARA-1080), which was fixed by PR #1188, was only a partial fix of the problem where the `/backport` command creates the local branch for the PR based off a stale copy of the target branch. The solution is to fetch the target branch from the target repo and base the patch off of that branch.
>> 
>> I didn't add any new tests for this case, so I'll file a follow-up issue.
>
> Kevin Rushforth has updated the pull request incrementally with one additional commit since the last revision:
> 
>   empty commit to trigger GitHub Actions

Marked as reviewed by ihse (Reviewer).

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PR: https://git.openjdk.java.net/skara/pull/1209