The new test pinned the wrapped height at four lines, which is four lines
on a Linux runner and four and a half on a Windows one, where the same
sentence in the same 400 pixels needs 54 of the box's 48. What the test is
actually about is that the height comes from the width the label has now
rather than the eight pixels it had while the window was being built, so it
measures that width itself and compares against the answer.