Don't assume transform is valid on access to matrix.

djdt · djdt · commit f46867e18742 · 2019-07-24T16:05:23.000+10:00
diff --git a/lib/matplotlib/transforms.py b/lib/matplotlib/transforms.py
@@ -1850,7 +1850,6 @@ def get_matrix(self):
 
         .
         """
-        self._invalid = 0
         return self._mtx
 
     def set_matrix(self, mtx):
