[OpenSCAD] BUG: minkowski() fills holes when used with 2D polygons

[Triffid Hunter]

// using 2c273159 - Wed Apr 4 01:46:50 2012 +0200 - Missing NULL check on
some normalization corner cases. Fixes #95


module object_with_holes() {

  difference() {

    square([20, 20], center=true);

    circle(r=5);

  }

}


 // does not work (fills in hole)

linear_extrude(height=1)

minkowski() {

  #object_with_holes();

  circle(r=1);

}


 // works as expected

translate([25, 0, 0])

minkowski() {

  linear_extrude(height=1)

    #object_with_holes();

  cylinder(r=1, h=0.01);

}
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