On 2014-03-26 19:35, Rik Kabel wrote, originally with the subject 
"Caption whitespace overflows page":
> How can I get rid of the space at the top of the first line of text on 
> page three in the following MWE. The \setupfloats[spaceafter=none] 
> masks the problem rather than addresses the problem directly. Playing 
> with the size of the figures (changing them to 3cm) shows that the  
> caption text is not pushed to the second page, just some whitespace 
> imputed to them. This happens with TL2013 and with the latest 
> (20140325) standalone beta.
>
> I may be able to get away with the figure overflowing into the 
> footnote space by avoiding footnotes, but the space on the next page 
> is just ugly.
>
>     \setuppapersize[A6]
>     \setupexternalfigures[location={local,default}]
>     \setupfloats[spaceafter=none]
>     \starttext
>     \input{knuth}
>     \placefigure[left]{Caption}
>       {\startcombination[1*3]
>         {\externalfigure[cow.pdf][height=2cm]}{cow}
>         {\externalfigure[cow.pdf][height=2cm]}{cow}
>         {\externalfigure[cow.pdf][height=2cm]}{cow}
>       \stopcombination}
>     \input{knuth}
>
>     \input{knuth}
>     \stoptext
>

Can anyone suggest a fix for this, or declare that there is nothing that 
can be done except to change the page content? It is still a problem.

The problem is not with caption space /per se/, but with the space taken 
for the figure as a whole. I would think that, once the page with the 
figure is finalized, additional reserved whitespace below it can be 
discarded.

I did notice that it was also raised without apparent resolution in 
March 2007 (http://www.mail-archive.com/ntg-context%40ntg.nl/msg21269.html).

-- 
Rik Kabel