Added and updated tests for minkowski2 with holes

testdata/scad/features/minkowski2-hole-tests.scad

@@ -0,0 +1,41 @@
+// HolePoly & Poly
+minkowski() {
+    difference() {
+        square([20,20], center=true);
+        square([10,10], center=true);
+    }
+    circle(r=1, $fn=16);
+}
+
+// Poly & HolePoly
+translate([25,0]) minkowski() {
+    circle(r=1, $fn=16);
+    difference() {
+        square([20,20], center=true);
+        square([10,10], center=true);
+    }
+}
+
+// IslandHolePoly
+translate([0,25]) minkowski() {
+    union() {
+        difference() {
+            square([20,20], center=true);
+            square([10,10], center=true);
+        }
+        square([2,2], center=true);
+    }
+    circle(r=1, $fn=16);
+}
+
+// HolePoly & HolePoly
+translate([25,25]) minkowski() {
+    difference() {
+        square([18,18], center=true);
+        square([12,12], center=true);
+    }
+    difference() {
+        circle(2, $fn=16);
+        circle(1, $fn=16);
+    }
+}

tests/regression/dumptest/minkowski2-hole-tests-expected.csg

@@ -0,0 +1,42 @@
+group() {
+	minkowski(convexity = 0) {
+		difference() {
+			square(size = [20, 20], center = true);
+			square(size = [10, 10], center = true);
+		}
+		circle($fn = 16, $fa = 12, $fs = 2, r = 1);
+	}
+	multmatrix([[1, 0, 0, 25], [0, 1, 0, 0], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+		minkowski(convexity = 0) {
+			circle($fn = 16, $fa = 12, $fs = 2, r = 1);
+			difference() {
+				square(size = [20, 20], center = true);
+				square(size = [10, 10], center = true);
+			}
+		}
+	}
+	multmatrix([[1, 0, 0, 0], [0, 1, 0, 25], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+		minkowski(convexity = 0) {
+			union() {
+				difference() {
+					square(size = [20, 20], center = true);
+					square(size = [10, 10], center = true);
+				}
+				square(size = [2, 2], center = true);
+			}
+			circle($fn = 16, $fa = 12, $fs = 2, r = 1);
+		}
+	}
+	multmatrix([[1, 0, 0, 25], [0, 1, 0, 25], [0, 0, 1, 0], [0, 0, 0, 1]]) {
+		minkowski(convexity = 0) {
+			difference() {
+				square(size = [18, 18], center = true);
+				square(size = [12, 12], center = true);
+			}
+			difference() {
+				circle($fn = 16, $fa = 12, $fs = 2, r = 2);
+				circle($fn = 16, $fa = 12, $fs = 2, r = 1);
+			}
+		}
+	}
+}