hg commit fails silently unless all changed files are committed

In commit dialog for an Hg repository: if user leaves any changed tracked files unchecked when commit button is clicked, commit says it succeeded, but when the app then returns to the history view, the commit does not exist and the commited files still read as changed.

The commit message is logged in the recent commit messages, but the commit never happens. If automatic push on commit is checked, the push fails because the commit does not exist.

commit works only if all tracked changed files are selected for committing.