rebase: add --update-refs=interactive

[intelfx]

In rebase-heavy workflows involving multiple interdependent feature branches, typing out --update-refs quickly becomes tiring, which can be mitigated with setting the rebase.updateRefs git-config option to perform update-refs by default.

However, the utility of rebase.updateRefs is somewhat limited because you rarely want it in a non-interactive rebase (as it does not give you the chance to review the update-refs candidates, likely leading to updating refs that you didn't want updated -- I made quite an amount of mess by setting this option and subsequently forgetting about it).

Try to find a middle ground by introducing a third value, --update-refs=interactive (and rebase.updateRefs=interactive) which means --update-refs when starting an interactive rebase and --no-update-refs otherwise. This option is primarily intended to be used in the gitconfig, but is also accepted on the command line for completeness.

[gitgitgadget-git]

Welcome to GitGitGadget

Hi @intelfx, and welcome to GitGitGadget, the GitHub App to send patch series to the Git mailing list from GitHub Pull Requests.

Please make sure that either:

• Your Pull Request has a good description, if it consists of multiple commits, as it will be used as cover letter.
• Your Pull Request description is empty, if it consists of a single commit, as the commit message should be descriptive enough by itself.

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CC: Revi Ewer <revi.ewer@example.com>, Ill Takalook <ill.takalook@example.net>

Also, it is a good idea to review the commit messages one last time, as the Git project expects them in a quite specific form:

• the lines should not exceed 76 columns,
• the first line should be like a header and typically start with a prefix like "tests:" or "revisions:" to state which subsystem the change is about, and
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Contributing the patches

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• Search: is:pr is:open "/allow"

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An alternative is the channel #git-devel on the Libera Chat IRC network:

<newcontributor> I've just created my first PR, could someone please /allow me? https://github.com/gitgitgadget/git/pull/12345
<veteran> newcontributor: it is done
<newcontributor> thanks!

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To iterate on your change, i.e. send a revised patch or patch series, you will first want to (force-)push to the same branch. You probably also want to modify your Pull Request description (or title). It is a good idea to summarize the revision by adding something like this to the cover letter (read: by editing the first comment on the PR, i.e. the PR description):

Changes since v1:
- Fixed a typo in the commit message (found by ...)
- Added a code comment to ... as suggested by ...
...

To send a new iteration, just add another PR comment with the contents: /submit.

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[gitgitgadget-git]

There are issues in commit 188e3f6:
rebase: add --update-refs=interactive``
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