[cl-typesetting-devel] Vertical space at the top and bottom of a page

[iso at wemba.edu.pl]

I want to separate paragraphs with vertical space, so I use

(paragraph (:h-align :left
             :top-margin 5
             :bottom-margin 5)
    "some text")

Unfortunately, when a page break falls between two paragraphs,
there is extra space at the top of the page, which looks
especially bad when I use a two-column layout. I think
vertical space should disappear at the top of the page
(it would be good if it could also disappear at the bottom,
with the difference being made up for by expansible boxes).
If I remember correctly, this is what TeX does.

This problem is particularly severe with section heading lines,
which I typeset as paragraphs with large top and bottom margins.
It's crucial that they be aligned with the top of the page.

I tried to set :top-margin to 0 and use only :bottom-margin,
but it did not help. The vertical space separating paragraphs
that appear on different pages is still visible, even at the
top of the page.

Any ideas how to deal with this? I was hoping to typeset
a brochure with cl-typesetting, but the uneven pages look
really bad.

If the current version of cl-typesetting is unable to
produce pages with the text starting always from the
top of the page, where should I look to modify the code?
TT::SPREAD-BOXES?

Thanks,
iso