FIX

jklymak · jklymak · commit 1e8658d52614 · 2021-05-29T13:54:59.000-07:00
diff --git a/lib/matplotlib/colorbar.py b/lib/matplotlib/colorbar.py
@@ -1024,15 +1024,19 @@ def _reset_locator_formatter_scale(self):
                 self.__scale = 'linear'
                 self.ax.set_xscale('linear')
                 self.ax.set_yscale('linear')
-        elif hasattr(self.norm, '_scale') and (self.norm._scale is not None):
+        elif hasattr(self.norm, '_scale') and self.norm._scale is not None:
+            # use the norm's scale:
             self.ax.set_xscale(self.norm._scale)
             self.ax.set_yscale(self.norm._scale)
             self.__scale = self.norm._scale.name
         elif type(self.norm) is colors.Normalize:
-            self.__scale = 'linear'
+            # plain Normalize:
             self.ax.set_xscale('linear')
             self.ax.set_yscale('linear')
+            self.__scale = 'linear'
         else:
+            # norm._scale is None or not an attr: derive the scale from
+            # the Norm:
             funcs = (self._forward_from_norm, self._inverse_from_norm)
             self.ax.set_xscale('function', functions=funcs)
             self.ax.set_yscale('function', functions=funcs)
diff --git a/lib/matplotlib/tests/test_colors.py b/lib/matplotlib/tests/test_colors.py
@@ -1406,6 +1406,5 @@ def test_norm_deepcopy():
     norm = mcolors.Normalize()
     norm.vmin = 0.0002
     norm2 = copy.deepcopy(norm)
-    assert isinstance(norm2._scale, mscale.LinearScale)
+    assert norm2._scale is None
     assert norm2.vmin == norm.vmin
-    assert norm2._scale is not norm._scale
