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From: Hans Hagen <pragma@wxs.nl>
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Subject: Re: strange dependency between cbox and
  whitespace?
Date: Thu, 19 Feb 2004 18:15:41 +0100
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At 17:57 19/02/2004, you wrote:
>Hi all!
>
>I came across the following behaviour: cboxes seem to suppress white space 
>in certain conditions.
>
>In the following example there is no whitespace output between paragraph 
>no. 2 und 3. Yet, if I change \setupwhitespace to 'none' or if I do not 
>enclose the paragraphs in cboxes then the whitespaces between the 
>paragraphs appear as expected.
>
>Does anyone know a workaround for this 'strange' behaviour of cboxes?
>
>Thanks for your attention,
>--Stefan
>
>
>\setupoutput[pdftex]
>\setupinteraction[openaction={firstpage,FitHeight},state=start]
>\setupwhitespace[small]
>\setupblank[100pt]
>\def\Para#1{\cbox{#1 \dorecurse{10}{this is some paragraph text}}\par}
>\starttext
>\Para{1}
>\blank[big]
>\Para{2}
>\blank[medium]
>\Para{3}
>\blank[small]
>\Para{4}
>\stoptext

has to do with the way tex handles vbox/vtop's (tex does not have dual 
baseline boxes)

\def\Para#1{\cbox{#1 \dorecurse{10}{\begstrut this is some paragraph text 
\endstrut}}\par}

or something:

\long \def\Para#1#2\EndPar{\startalign[middle]#1 #2\stopalign}