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Can you add a test for this?

This is still a band-aid over the underlying problem in my opinion, but probably worth adding still. This won't help people setting vmin/vmax manually outside of theset_clim() call.

The issue is still with who should own the updates to the norm, the colorbar or the norm setting and does one take precedence over the other. My guess is that we need to try and push the colorbar's auto-expansion logic up into the initializer somehow rather than at draw time.

Looks good to me, thanks for updating this!

Note to second reviewer, please squash merge.