Function parse_incremental_suffix 

pub fn parse_incremental_suffix(
    input: &str,
    config: Option<ParserOptions>,
    old_tree: &SyntaxNode,
    old_edit_range: (usize, usize),
    new_edit_range: (usize, usize),
) -> IncrementalParseResult

Incrementally update a syntax tree by reparsing either a bounded section window (between top-level headings) or from a safe restart boundary to EOF.

Convenience wrapper that scans input for refdef labels via collect_refdef_labels before reparsing. Callers that already have a precomputed RefdefMap (e.g. salsa-cached) should use parse_incremental_suffix_with_refdefs to skip the scan.