Use guarded autoscale_None for use when vmin/vmax are None.

erykoff · erykoff · commit c8b5deaae849 · 2022-09-19T08:47:20.000-07:00
diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
@@ -4943,7 +4943,7 @@ def reduce_C_function(C: array) -> float
         # autoscale the norm with current accum values if it hasn't been set
         if norm is not None:
             if norm.vmin is None and norm.vmax is None:
-                norm.autoscale(accum)
+                norm.autoscale_None(accum)
 
         if bins is not None:
             if not np.iterable(bins):
