Function rewrite_project_res_data

perro_editor/res/scripts/ui/editor_ui.rs:3583–3595

(data: &mut SceneNodeData, project_root: &str)

/// Dirs (trailing `/`, plus the synthetic `res://` root) that contain at
/// least one entry in the full unfiltered file list. Collapsed folders keep
/// their disclosure triangle from this set even though their contents are
/// culled from the visible rows.
fn file_dirs_with_children(state: &EditorState) -> std::collections::HashSet<String> {
    let mut out = std::collections::HashSet::new();
    for path in &state.file_paths {
        let trimmed = path.strip_suffix('/').unwrap_or(path);
        if let Some(pos) = trimmed.rfind('/') {
            out.insert(trimmed[..pos + 1].to_string());
        }
    }
    out
}

fn filtered_file_cache_key(state: &EditorState) -> String {
    format!(