Frame around float and its caption, how to?

["Stefan Müller" <warrence.stm@gmx.de>]

Hi list,

I'm using 201100920 00:09 MkIV standalone.  Some time ago Marcin 
Borkowski asked [1] on this list about framing floats together with 
their captions.  It seems to be unanswered and now I stumbled upon a 
similar problem.  I want to have a figure with a caption together in a 
frame as wide as the surrounding text, aka \textwidth and the caption 
filling the available horizontal space.  I.e. I want something like

\setupcaption[width=\textwidth]
\starttext
\placefigure[here]{\input tufte}{\externalfigure[cow]}
\stoptext

with a frame around it.

I see two approaches here and none of them gives me what I need.  First
using \setupfloat[frame=on] only frames the cow and not the caption.  I 
think I can manually correct this with "framedepth" and "width" but 
doing something "manually" in ConTeXt seems not like a good idea.  Am I 
overlooking something about \setupfloat?

Secondly, I tried \framed{...} around \placefigure but there are two 
issues here: How do I setup the caption to fit nicely into the frame? 
"\setupcaption[width=\textwidth]" is to much because of the frame 
spacing...  And there is another serious issue, see the following 
minimal example.  The frame is where the figure was placed but is empty, 
because the figure floated to the next page.

\setupcaption[width=max]
\starttext
\dorecurse{2}{\input tufte \par}
\framed{\placefigure[here][fig:muh]{\input tufte}{\externalfigure[cow]}}
\input tufte
\stoptext

I have no idea how to procede with this.  Hopefully someone on this list 
knows how to do this right.

Thanks in advance,
Stefan.

[1] 
http://archive.contextgarden.net/message/20090724.123610.ddad55af.en.html
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