Fixed bug introduced to clear_poly() in previous commit.

FlatCAMObj.py

@@ -987,9 +987,12 @@ class FlatCAMGeometry(FlatCAMObj, Geometry):
             assert isinstance(geo_obj, FlatCAMGeometry)
             #assert isinstance(app_obj, App)
 
-            cp = self.clear_polygon(poly.buffer(-self.options["paintmargin"]), tooldia, overlap=overlap)
             if self.options["paintmethod"] == "seed":
                 cp = self.clear_polygon2(poly.buffer(-self.options["paintmargin"]), tooldia, overlap=overlap)
+
+            else:
+                cp = self.clear_polygon(poly.buffer(-self.options["paintmargin"]), tooldia, overlap=overlap)
+
             geo_obj.solid_geometry = list(cp.get_objects())
             geo_obj.options["cnctooldia"] = tooldia
             self.app.inform.emit("Done.")

camlib.py

@@ -331,6 +331,8 @@ class Geometry(object):
         :return:
         """
 
+        assert type(polygon) == Polygon
+
         ## The toolpaths
         # Index first and last points in paths
         def get_pts(o):
@@ -347,9 +349,19 @@ class Geometry(object):
         while True:
             current = current.buffer(-tooldia * (1 - overlap))
             if current.area > 0:
-                geoms.insert(current.exterior)
+
-                for i in current.interiors:
+                # current can be a MultiPolygon
-                    geoms.insert(i)
+                try:
+                    for p in current:
+                        geoms.insert(p.exterior)
+                        for i in p.interiors:
+                            geoms.insert(i)
+
+                # Not a Multipolygon.
+                except TypeError:
+                    geoms.insert(current.exterior)
+                    for i in current.interiors:
+                        geoms.insert(i)
             else:
                 break
         return geoms