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matplotlib__matplotlib-25079

Based on my knowledge of the matplotlib codebase and the issue description, I need to generate a patch for the bug where setting norm with an existing colorbar fails in 3.6.3. The issue is in the ScalarMappable.norm setter in…

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# matplotlib__matplotlib-25079
# Loki Mode Multi-Agent Patch
# Attempts: 1

Based on my knowledge of the matplotlib codebase and the issue description, I need to generate a patch for the bug where setting `norm` with an existing colorbar fails in 3.6.3. The issue is in the `ScalarMappable.norm` setter in `lib/matplotlib/cm.py`.

Looking at the traceback and the bug description:
1. When `plot.norm = LogNorm(vmin, vmax)` is set, the colorbar's internal mappable needs to be properly updated
2. The old norm callback connection needs to be disconnected and a new one connected
3. The `autoscale_None

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