PR Summary

Closes#21441

import matplotlib.pyplot as pltfig = plt.figure()pos1 = [0.1, 0.1, 0.3, 0.8]pos2 = [0.5, 0.1, 0.4, 0.6]ax1 = plt.axes(position = pos1)ax1.plot([0,1], [0, 1], color = 'r', linewidth = 3)ax2 = plt.axes(position = pos2)ax2.plot([1, 0], [0, 1], color = 'b', linestyle = '--')

is documented to work, but position is silently ignored.position is just redundant withrect, so go ahead and check for position if rect is None.

PR Checklist

• Has pytest style unit tests (andpytest passes).
• IsFlake 8 compliant (runflake8 on changed files to check).
• New features are documented, with examples if plot related.
• Documentation is sphinx and numpydoc compliant (the docs shouldbuild without error).
• Conforms to Matplotlib style conventions (installflake8-docstrings and runflake8 --docstring-convention=all).
• New features have an entry indoc/users/next_whats_new/ (follow instructions in README.rst there).
• API changes documented indoc/api/next_api_changes/ (follow instructions in README.rst there).