avoid split if satin doesn't need it

lib/elements/satin_column.py

@@ -1346,7 +1346,7 @@ class SatinColumn(EmbroideryElement):
 
     def _get_split_points_staggered(self, a, b, a_short, b_short, length, count=None, length_sigma=0.0, random_phase=False, min_split_length=None,
                                     seed=None, row_num=0, from_end=False, _staggers=None):
-        if not length:
+        if not length or a.distance(b) <= length:
             return []
 
         if _staggers is None: