constrained_layout + fixed-aspect axes + bbox_inches="tight"

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

Provide feedback