- Auto leading stays auto: each line takes the paragraph's share (key 7)
of the largest type on it. The leading was the first two lines'
distance for every line, so 10 pt lines under a 15 pt heading came in
18 pt apart.
- The paragraph's hyphenation options (keys 10 to 15) are read.
- Area type of one frame whose last lines the file sets, but which don't
fit here (the fallback font, or a descent past the frame's bottom),
gets a frame taller from its bottom (vectorcraft_text::fit_source_lines),
with a warning.
A user's .ai whose type differed from its page by 6.6%, so that it opened
from its PDF part with each line its own text object, now opens from its
layers.