Merge pull request #25291 from anntzer/cgtii

greglucas · web-flow · commit b7324b254685 · 2023-03-26T10:38:30.000-06:00
Limit full-invalidation of CompositeGenericTransforms.
diff --git a/lib/matplotlib/transforms.py b/lib/matplotlib/transforms.py
@@ -2357,14 +2357,9 @@ def frozen(self):
         return frozen
 
     def _invalidate_internal(self, level, invalidating_node):
-        # In some cases for a composite transform, an invalidating call to
-        # AFFINE_ONLY needs to be extended to invalidate the NON_AFFINE part
-        # too. These cases are when the right hand transform is non-affine and
-        # either:
-        # (a) the left hand transform is non affine
-        # (b) it is the left hand node which has triggered the invalidation
-        if (not self._b.is_affine and
-                (not self._a.is_affine or invalidating_node is self._a)):
+        # When the left child is invalidated at AFFINE_ONLY level and the right child is
+        # non-affine, the composite transform is FULLY invalidated.
+        if invalidating_node is self._a and not self._b.is_affine:
             level = Transform._INVALID_FULL
         super()._invalidate_internal(level, invalidating_node)
 
