Re: Lyrics break estimation of vertical spacing

[Boris Shingarov]

> Right, the positions of the staff lines relative to each other are not
 > yet computed, so each extent is relative to its own staff.

Hmm, let me understand this better.
Does it mean that Constrained_breaking::fill_line_details() gets
called before the line breaks are calculated, and then again after
they are known?  and at that later stage, sys->pure_height()
(constrained-breaking.cc:461) should return a smaller value?
but no, it's the "pure" one, i.e. by definition pre-linebreak...