pandoc context template forces linkstyle, linkcolor, and linkcontrastcolor off by default

["T. Kurt Bond" <tkurtbond-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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I'm always surprised when I produce a PDF with pandoc via context output
and the hyperlinks are indistinguishable from normal text so I can't tell
where they are.  It turns out that the template for context output
unconditionally sets linkstyle, linkcolor, and contrastcolor to the values
of the variables $linkstyle$, $linkcolor$, and $linkcontrastcolor$ *even if
the user hasn't specified them.*  This forces those all off.

Here's the code from pandoc -D context (pandoc version 2.14.0.1):

% Enable hyperlinks
\setupinteraction
  [state=start,
$if(title)$
  title={$title$},
$endif$
$if(subtitle)$
  subtitle={$subtitle$},
$endif$
$if(author)$
  author={$for(author)$$author$$sep$; $endfor$},
$endif$
$if(keywords)$
  keyword={$for(keywords)$$keywords$$sep$; $endfor$},
$endif$
  style=$linkstyle$,
  color=$linkcolor$,
  contrastcolor=$linkcontrastcolor$]

I think the last three lines should be

$if(linkstyle)$
  style=$linkstyle$,
$endif$
$if(linkcolor)$
  color=$linkcolor$,
$endif$
$if(linkcontrastcolor)$
  contrastcolor=$linkcontrastcolor$
$endif$
  ]

instead, so the style, color, and contrast color are only set if the user
specifies those variables.  This way the document gets the default ConTeXt
style, color, and contrast color.

-- 
T. Kurt Bond, tkurtbond-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org, https://tkurtbond.github.io

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