Merge branch 'pt/pull-tests'

Add more test coverage to "git pull". * pt/pull-tests: t5520: check reflog action in fast-forward merge t5521: test --dry-run does not make any changes t5520: test --rebase failure on unborn branch with index t5520: test --rebase with multiple branches t5520: test work tree fast-forward when fetch updates head t5520: test for failure if index has unresolved entries t5520: test no merge candidates cases t5520: prevent field splitting in content comparisons