Removing inbreakable whitespace at pagebreaks

["Wolfgang Schuster" <schuster.wolfgang@googlemail.com>]

Hi,

I try to take care in my letter module to keep at least the last sentence
in the text the signature together on the same page, this did work but
I introduced another problem.

To get no linebreak between my two sections I used a nonbreakable
whitespace between both but my implementation has the side effect
to keep the whitespace also if there is no signature after the text even
if it the last vertical skip before the page break.

You can see in the following example what I mean.

\setuplayout[lines=10]\showgrid
\starttext
\blank[force,9*line]
text
\par\nobreak\blank[line]
\stoptext

The last line of text is moved to the second although it would fit on the
first page, I could use twopassdata in my module to get the information
if the \nobreak is needed on this place but I hope there is also a solution
to remove the skip in the first run, maybe for MkIV only.

I looked yesterday in the sources and saw \vspacing in core-spa.mkiv,
I dont't know what this should do and was unable to get it working but
I'm interested to know how it did work and what it should do.

Greetings
Wolfgang
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