Function count_visual_rows_for_text 

pub fn count_visual_rows_for_text(
    line_text: &str,
    effective_width: usize,
    gutter_width: usize,
    hanging_indent: bool,
) -> u32

Count visual rows for a single line’s text under the renderer’s wrap algorithm. Pure function of (text, geometry).

Behaves exactly like the renderer’s per-logical-line wrap count: runs apply_wrapping_transform on a single-Text-token input and tallies non-empty rows. A trailing Break emitted when the last chunk exactly fills the effective width is followed by nothing meaningful and does not count as a row.