multipart geometry in intersect region (#1475)

lib/stitches/fill.py

@@ -143,8 +143,8 @@ def intersect_region_with_grating(shape, angle, row_spacing, end_row_spacing=Non
 
         res = grating_line.intersection(shape)
 
-        if (isinstance(res, shapely.geometry.MultiLineString)):
-            runs = [line_string.coords for line_string in res.geoms]
+        if (isinstance(res, shapely.geometry.MultiLineString) or isinstance(res, shapely.geometry.GeometryCollection)):
+            runs = [line_string.coords for line_string in res.geoms if isinstance(line_string, shapely.geometry.LineString)]
         else:
             if res.is_empty or len(res.coords) == 1:
                 # ignore if we intersected at a single point or no points