unlinkpath: make empty directory removal optional (issue5901) (issue5826) There are known cases where performing operations such as rebase from a directory that is newly created can fail or at least lead to being in a directory handle that no longer exists. This is even reproducible by just doing something as simple as: cd foo; hg rm * The behavior is different if you use `hg addremove`, the directory is not removed until we attempt to go back to the node after committing it: cd foo; rm *; hg addremove; hg ci -m'bye foo'; hg co .^; hg co tip Differential Revision: https://phab.mercurial-scm.org/D3859