Bug summary

colorbar seems to ignore the keyword setting panchor=False

Code for reproduction

import matplotlib
print('mpl version:', matplotlib.__version__)
import matplotlib.pyplot as plt
import numpy as np

fig = plt.figure(figsize=(5, 8))
ax = fig.add_subplot(1, 1, 1, aspect=0.5, anchor="N")

a = np.arange(12)[:,np.newaxis] * np.ones(8)
levels = np.arange(1.5, 10, 2)

plt.contourf(a, cmap='RdYlBu', levels=levels, extend='both')
print('anchor before colorbar:', ax.get_anchor())
plt.colorbar(orientation='horizontal', panchor=False)
print('anchor after colorbar:', ax.get_anchor())

Actual outcome

mpl version: 3.6.0.dev2341+g3df958c760
anchor before colorbar: N
anchor after colorbar: (0.5, 0.0)

Expected outcome

My reading of the docs is that the axes anchor should still be "N" after I add the colorbar. Though given #18752, it's possible I have misunderstood!

panchor(float, float), or False, optional

The anchor point of the colorbar parent axes. If False, the parent axes' anchor will be unchanged. Defaults to (1.0, 0.5) if vertical; (0.5, 0.0) if horizontal.

Additional information

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Operating system

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Matplotlib Version

main branch (3.6.0.dev2341+g3df958c760), 3.5.2 and some older (3.3+) versions.

Matplotlib Backend

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Python version

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Jupyter version

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Installation

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