shoes/shoes4 — pull request #842 by jasonrclark (2014-08-10 03:10:06+00:00)
Title: Fix for unbounded height crash on centering

With certain values, a centered text segment is coerced into thinking it has
unbounded height (which is set as a symbol, not a number) and was later
incorrectly used in some position math.

Calculating the first_height now gates for the :unbounded symbol so we don't
crash on it.

Fixes #824

cc/ @miller0929