\dontleavehmode and indenting after section (was Re: Context 2006.08.04 released)

[Sanjoy Mahajan <sanjoy@mrao.cam.ac.uk>]

Hans wrote:
> > Is that better than using \noindentation (suggested by the other
> > Mahajan)?  The one problem with it that I found is an extra space in
> > indentation for the first paragraph. I guess it's because there's a
> > space in horizontal mode somewhere that isn't being ignored (as it
> > would have been in vertical mode)?
> >   
> hm, try to nail that space down and let me know 

I couldn't find the extra space in the source, but here's the minimal
test file in the hope that your eyes and understanding are sharper.
The "I" from Indented?  is indented a tiny bit relative to the section
number (context 2006.08.02):

\setuphead[section][after={\dontleavehmode}] 
\starttext
\section{First}
Indented?
\stoptext