rebase

git rebase -i master

it mutates the feature1 branch
[...masterCommits, ...feature1Commits]

changes feature1 commit hashes, keeps timestamps. Now you have to force push to origin feature1

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Kinda like

git stash
git pull  # on master
git switch -c feature1
git stash pop

You're putting your changes on top.

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origin feature vs origin/feature

git pull origin feature
# also
git pull --rebase origin feature

git fetch origin
git rebase origin/feature