A wrapped label kept the full 78px it was allowed to wrap at, so the
two-word labels of Review and References made every button there 90px wide
against 40–70px elsewhere. One- and two-word labels now hug their longest
line — a longer one keeps the cap, or it would break into a third line and
run out of the band. The split button's arrow follows the narrower label
instead of overlapping it, so each half tints only its own surface.