"git checkout -m another-branch" was invented to deal with local
changes to paths that are different between the current and the new
branch, but it gave only one chance to resolve conflicts. The command
was taught to create a stash to save the local changes.
* hn/git-checkout-m-with-stash:
checkout -m: autostash when switching branches
checkout: rollback lock on early returns in merge_working_tree
sequencer: teach autostash apply to take optional conflict marker labels
sequencer: allow create_autostash to run silently
stash: add --label-ours, --label-theirs, --label-base for apply
d17a7b8191