Function cell_text 

pub fn cell_text(text: Cow<'_, str>, g: &Glyphs, cells: usize) -> String

preview of the start of text that covers more than cells cells, ending in the ellipsis when cut: a cell draws only its start, and measuring a huge value whole costs what the value costs. Drawn at cells or fewer, it reads and measures as the whole value would. An owned text that needs neither cut nor mark is kept, not copied.