starting point specified by fill_start command

lib/elements/auto_fill.py

@@ -100,13 +100,21 @@ class AutoFill(Fill):
     def fill_shape(self):
         return self.shrink_or_grow_shape(self.expand)
 
+    def get_starting_point(self, last_patch):
+        # If there is a "fill_start" Command, then use that; otherwise pick
+        # the point closest to the end of the last patch.
+
+        if self.get_command('fill_start'):
+            return self.get_command('fill_start').target_point
+        elif last_patch:
+            return last_patch.stitches[-1]
+        else:
+            return None
+
     def to_patches(self, last_patch):
         stitches = []
 
-        if last_patch is None:
-            starting_point = None
-        else:
-            starting_point = last_patch.stitches[-1]
+        starting_point = self.get_starting_point(last_patch)
 
         if self.fill_underlay:
             stitches.extend(auto_fill(self.underlay_shape,