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From: Hans Hagen <pragma@wxs.nl>
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Subject: Re: ConTeXt: Math: \mframed in display mode
Date: Sat, 27 Feb 1999 14:59:58 +0100
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Taco Hoekwater wrote:

> For Hans: You need to remove the \restoremathstyle from \normalstrut
> redef to get this to work OK.

How about this patch (core-rul.tex): 

\def\domframed[#1][#2]#3%
  {\begingroup
   \ifmmode
     \ifinner
       \let\mframedstyle\restoremathstyle
     \else
       \let\mframedstyle\displaystyle
     \fi
   \else
     \let\mframedstyle\restoremathstyle
   \fi
   #1\ifdone
     \def\normalstrut{$\mframedstyle\vphantom($}%
     \framed
       [\c!kaderoffset=\@@oioffset,\c!offset=\v!overlay,#2]
       {$\mframedstyle#3$}%
   \else
     \inframed
       [#2]
       {$\mframedstyle#3$}%
   \fi
   \endgroup}

The next ones go ok then. 

$\mframed{\frac{a}{b} = c}$

$$\mframed{\frac{a}{b} = c}$$

$$\mframed{\displaystyle \frac{a}{b} = c}$$

$$\frac{a}{b} = c$$

For those unaware of \mframed, I added this one for Tobias some time
ago. It is present in the latest contexts. The complication in these
macro(s) lays in trying to find out the right math modes/styles. 

Hans

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