How many lines of the quad are kept together near a page break. @racket[keep-first-lines] sets the minimum number of lines that appear before a page break; @racket[keep-last-lines] sets the minimum number that appear after. In both cases, they take a non-negative integer string as a value, or @racket["all"].
If the value (of one or both attributes) is @racket["all"], then all the lines of the quad are kept the same page. Be careful with this option —it's possible to make a single quad that is longer than one page, in which case @racketmodname[quadwriter] will ignore the setting to prevent an impossible situation.
If the value (of one or both attributes) is @racket["all"], then all the lines of the quad are kept on the same page. Be careful with this option —it's possible to make a single quad that's longer than one page, in which case @racketmodname[quadwriter] will ignore the setting to prevent the annihilation of the universe.
