Fix stop command (#1841)

lib/stitch_plan/stitch_plan.py

@@ -40,6 +40,9 @@ def stitch_groups_to_stitch_plan(stitch_groups, collapse_len=None, min_stitch_le
         if color_block.color != stitch_group.color:
             if len(color_block) == 0:
                 # We just processed a stop, which created a new color block.
+                # end the previous block with a color change
+                stitch_plan.color_blocks[-2].add_stitch(color_change=True)
+
                 # We'll just claim this new block as ours:
                 color_block.color = stitch_group.color
             else:

lib/threads/color.py

@@ -66,7 +66,7 @@ class ThreadColor(object):
         return hash(self.rgb)
 
     def __ne__(self, other):
-        return not(self == other)
+        return not (self == other)
 
     def __repr__(self):
         return "ThreadColor" + repr(self.rgb)