David Kastrup <dak <at> gnu.org> writes:
> #(set! empty-stencil (ly:make-stencil '() empty-interval empty-interval))
> \markup \fill-line { }
> Basically, the first \markup produces an empty stencil with extents
> (+inf.0 . -inf.0) and the page breaking code goes bonkers on that.
>
\paper {annotate-spacing = ##t}
indicates proper estimates for any scores after the \fill-line, and
indirectly shows zero space allowed for the \fill-line, so the
height estimations seem reasonable.
The problem appears only when \fill-line is the first markup, so maybe
a bad initialization in one of
page-breaking.cc page-layout-problem.cc page-spacing.cc
At some point, you made a change so that \line {} would return a
non-empty extent; possibly \fill-line needs that as well.
Of course I recommend first fixing the bugs you can with the existing
definition of "empty" stencil extents. The redundant line in dots.cc,
the ref-point for \parenthesize, and having the spacing functions
recognize \hspace and space appropriately, can be resolved before
changing 'empty-stencil'.
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