copy: recommend `--at-rev .` if target was added in parent commit...
copy: recommend `--at-rev .` if target was added in parent commit
If the target file was added in the working copy parent, it's much
more likely that the user meant to use `--at-rev .` (to record the
copy/rename in the that commit) than `--force` (to replace the
just-added file by another file).
Differential Revision:
https://phab.mercurial-scm.org/D11667