Clipping bug in MetaPost with MkIV

["Wolfgang Schuster" <schuster.wolfgang@googlemail.com>]

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Hi,

I make a hole in a MetaPost graphic and add a graphic as background but
in MkIV I get no hole but the lines I try to remove are still visible.

All files with the two results from MkII (what I want) and MkIV are in
the attachment.

\starttext

\startMPcode

picture temp ;
path mask ;

draw (0,1cm)--(2cm,1cm) ;
draw (1cm,0)--(1cm,2cm) ;

temp := currentpicture ;
currentpicture := nullpicture ;
mask := unitsquare scaled 2cm -- reverse fullsquare scaled 1cm shifted
(1cm,1cm) -- cycle ;
clip temp to mask ;
currentpicture := temp ;
draw fullsquare scaled 5mm shifted (1cm,1cm) ;

temp := currentpicture ;
currentpicture := nullpicture ;
externalfigure "holz280.jpg" scaled 2cm ;
addto currentpicture also temp ;

\stopMPcode

\stoptext

Wolfgang

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