avoid repeatedly changing colour to same colour

Author: Simul-Eqn

src/turtlethread/stitches.py

@@ -40,7 +40,12 @@ def to_pyembroidery(self) -> pyembroidery.EmbPattern:
         pattern = pyembroidery.EmbPattern()
         for stitch_group in self.stitch_groups:
             if (not isinstance(stitch_group, JumpStitch)) and stitch_group.color is not None: 
-                pattern += stitch_group.color 
+                change_col = True 
+                if len(pattern.threadlist) > 0: 
+                    change_col = (pattern.threadlist[-1].hex_color() != pyembroidery.EmbThread(stitch_group.color).hex_color())
+                
+                if change_col: 
+                    pattern += stitch_group.color 
 
             scaled_stitch_commands = (
                 (x * self.scale, y * self.scale, cmd) for x, y, cmd in stitch_group.get_stitch_commands()

src/turtlethread/turtle.py

@@ -617,6 +617,8 @@ def end_fill(self):
 
 
     def color(self, newcol: str): 
+        if newcol == self.curr_color: 
+            return  # make no change, to avoid asking the user to repeatedly change thread 
         # We need to change the stitch group so that the color change is reflected!
         if self._stitch_group_stack:
             previous_stitch_group = self._stitch_group_stack.pop()