That’s not possible – simply imagine what would happen if there was a conflict that couldn’t be resolved automatically. For the same reason you also can’t update branches that are not currently checked-out (even if a fast-forward was possible).
That’s not possible – simply imagine what would happen if there was a conflict that couldn’t be resolved automatically. For the same reason you also can’t update branches that are not currently checked-out (even if a fast-forward was possible).