tests: add more complete test for status changes on amend This demonstrates that missing/untracked files are handled incorrectly. The correct outputs are suppressed by (false !), and wrong outputs are added with (true !) instead. The setup code is copied from test-status-rev.t.

scmutil: don't try to delete origbackup symlinks to directories (issue5731) When origbackuppath is set, when looking to see if a file we are backing up conflicts with a directory in the origbackuppath, we incorrectly match on symlinks to directories. This means we try to call vfs.rmtree on the symlink, which fails. Differential Revision: https://phab.mercurial-scm.org/D1311

tests: add a test demonstrating issue5731 If origbackups are in use, a symlink to a valid directory is backed up, and an update is made that attempts to backup a file or link over that symlink, we abort with a bad error message instead of successfully updating. Differential Revision: https://phab.mercurial-scm.org/D1310