Dear list,

To get properties of a figure without actually typesetting it, it is
handy to use \registerexternalfigure.  However, trying to use it fails.
Consider the following MWE:

    \starttext
    \registerexternalfigure[cow.pdf]
    \stoptext

Looking at the definition in grph-inc.mkiv reveals that is it complete
bogus.

    \unexpanded\def\registerexternalfigure
      {\dotripleempty\grph_include_register}
    
    \def\grph_include_register[#1][#2][#3]%
      {\startnointerference
         \c_grph_include_test_only
         \setfalse\c_grph_include_flush % == test ?
         \externalfigure[#1][#2][#3]% or
         \externalfigure[#1][#2,\c!display=,\c!mask=,\c!object=\v!no]%
       \stopnointerference}

I guess this is not intentional and was left over at some point.  Could
you please fix this?

Cheers,
Henri
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