Source: devblogs.microsoft.com

Pull Requests with Rebase
Pull Requests with RebaseEdwardWe’re excited to roll out another way to integrate your pull requests in Azure Repos.
Arriving in the Sprint 150 update is an option to rebase your pull request into the target branch.
All the individual commits in the pull request branch are preserved as-is, and a new merge commit is created to unite the master branch and the pull request branch.
It emulates running git rebase master on the pull reuqest branch, followed by git merge pr --ff-only on the master branch.
It emulates running git rebase master on the pull request branch, followed by git merge pr --no-ff on the master branch.

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