When a partially staged file name contains one or more spaces or special characters, git status --porcelain escapes and quotes the file name (see https://github.com/okonet/lint-staged/blob/master/lib/gitWorkflow.js#L161). Consequently, gitWorkflow.hideUnstagedChanges() fails with a pathspec error since execa expects arguments to not be escaped or quoted:

[SUCCESS] Preparing...
[STARTED] Hiding unstaged changes to partially staged files...
[FAILED] error: pathspec '"src/file with spaces.ts"' did not match any file(s) known to git

  ✖ lint-staged failed due to a git error.
  Any lost modifications can be restored from a git stash:

    > git stash list
    stash@{0}: automatic lint-staged backup
    > git stash apply --index stash@{0}

This PR resolves the problem by using the machine output from git-status instead. Note: the order of renamed files in the status output is reversed and separated by a NUL character (instead of ->) when machine output (-z option) is specified.