Bug report

Bug summary

constrained_layout, fixed aspect axes (e.g. from imshow), and savefig(bbox_inches="tight") don't play well together.

Code for reproduction

fig = plt.figure(constrained_layout=True)
fig.add_subplot().imshow(np.random.rand(10, 10))
fig.savefig("/tmp/out.png", bbox_inches="tight")

Actual outcome

The axes are cropped, and the aspect=1 is lost (pixels are not square anymore, but slightly elongated).

Expected outcome

Not the above.

Matplotlib version

• Operating system: linux
• Matplotlib version (import matplotlib; print(matplotlib.__version__)): HEAD
• Matplotlib backend (print(matplotlib.get_backend())): agg
• Python version: 39
• Jupyter version (if applicable):
• Other libraries: