Packs items into lines that do not exceed wrapWidth except for a
single unbreakable run longer than the measure (emergency overflow).
spacing is inserted between adjacent items on a line, matching
letterSpacing. Empty items yields no lines — the caller maps an empty
paragraph onto a blank \n line itself.
Packs
itemsinto lines that do not exceedwrapWidthexcept for a single unbreakable run longer than the measure (emergency overflow).spacingis inserted between adjacent items on a line, matchingletterSpacing. Emptyitemsyields no lines — the caller maps an empty paragraph onto a blank\nline itself.