Merge branch 'rj/branch-unborn-in-other-worktrees'

Error messages given when working on an unborn branch that is checked out in another worktree have been improved. * rj/branch-unborn-in-other-worktrees: branch: avoid unnecessary worktrees traversals branch: rename orphan branches in any worktree branch: description for orphan branch errors branch: use get_worktrees() in copy_or_rename_branch() branch: test for failures while renaming branches