Ulrich --
On Sun, Aug 14, 2022, Ulrich Lauther wrote:
> I found the culprit. It is in my macro NumberPages that you see
> at the top of my example file. Only if I call this macro, the
> problem occurs.
> .MAC NumberPages END
> .PRINTSTYLE TYPESET
> .HEADERS OFF
> .FOOTERS OFF
> .PAGINATE
> .PAGENUM_POS BOTTOM RIGHT
> .PAGENUMBER_STRING "\\$1 \\*[PAGE#] \\$2"
> .START
> .END
The problem stems from mom inhibiting vertical spacing (.ns)
• at the start of documents/chapters, whether or not a docheader
is printed
• after page transitions
Restoration of spacing is controlled by a trap just underneath the
first line of body text on the page.
In the case of the first line being the one under the docheader,
.RESTORE_SPACE must be used (see the docs).
First lines on subsequent pages are trickier since the HEADER macro
sets .ns. Short of studying the output to see where .RESTORE_SPACE
would need to be inserted, a more radical solution is required:
re-define the SPACE macro.
.rm SPACE
.de SPACE
. ie \\n[.ns] \{\
. rs
. vpt 0
. nop \&
. vpt
. sp -1
. sp
. \}
. el .sp
..
This ensures that .ns is removed when SPACE is called. It fixes the
problem for your sample file, though I'm not sure how robust it is
for real-world files.
--
Peter Schaffter
https://www.schaffter.ca
