Function apply_refactor_plan_checked_with_overrides 

pub fn apply_refactor_plan_checked_with_overrides(
    plan: &RefactorPlan,
    preview_only: bool,
    workspace_roots: Option<&[PathBuf]>,
    document_overrides: Option<&HashMap<PathBuf, String>>,
) -> Result<usize>

Apply plan with optional open-buffer overrides used for compare-and-swap.