[NTG-context] section with \sethupead[section][alternative=text]; other type of section misbehaves..

[Rob Heusdens]

I forgot to add the basic example, with neither for section nor for
summary an option set in \setuphead[..] for alternative.

So, read this as example 0: = test5.pdf

Example 0:

\defineblank[sprong][.5cm]
\definehead[summary][section]
\setuphead[section][number=no,style=bold,before={\blank[sprong]},after=,indentnext=no]
\setuphead[summary][number=no,style=bold,before=,after={\blank[sprong]},beforesection={\noindentation\page\starttextbackground[SummaryBackground]},aftersection={\stoptextbackground\page}]
\setupwhitespace[none]
\setupindenting[yes, small, next]
\definetextbackground
  [SummaryBackground]
  [frame=off,frameoffset=0pt,
   background=color,
   backgroundcolor=gray,
   backgroundoffset=2ex]
\starttext
\section{First sentence. Second sentence.}\input zapf
\summary{Summary}\input zapf
\stoptext



Example 0 => Example 1

Setting the alternative=text for section also causes a change in behaviour
of the summary section.
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