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Add a section on external figure discovery
The implementation in MkIV is completely new, and various details have changed. The most important difference seems to be that the new grid by default is less tolerant for superscripts, but it can be made so by using <cmd>setuplayout[grid=tolerant]</cmd>
= External figures =
There was a change in the default path search for external figures, but I don't know the exact details off-hand.
IIRC, the main problem is that texmf tree images are now found before local images. To change this ordering,
use the <tt>location</tt> key to <cmd>setupexternalfigures</cmd>:
<texcode>
\setupexternalfigures[location={local,global,default}]
</texcode>
<tt>local</tt>: current directory + <tt>..</tt> + <tt>../..</tt>
<tt>global</tt>: paths set with <tt>directory=...</tt>
<tt>default</tt>: texmf tree
