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matplotlib__matplotlib-25498

Based on my knowledge of matplotlib's architecture and the issue description, I can construct the fix. The problem is in the ScalarMappable class in lib/matplotlib/cm.py. When the norm property is set to a new normalizer, the code needs to:

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Based on my knowledge of matplotlib's architecture and the issue description, I can construct the fix. The problem is in the `ScalarMappable` class in `lib/matplotlib/cm.py`. When the `norm` property is set to a new normalizer, the code needs to:

1. Call `autoscale_None` on the new norm to preserve/set vmin/vmax values
2. Call `self.changed()` to notify listeners (like the colorbar)

Looking at the error message and the hints, the fix should be in the `norm` setter. Here's the patch:

--- a/lib/matplotlib/cm.py
+++ b/lib/matplotlib/cm.py
@@ -343,6 +343,11 @@ class ScalarMappable(object):
    

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