Bug summary

imshow rendering changed from 3.1.0 to 3.1.1 whenyticks ar set.
Square matrix display is no longer square.
Note that settingxticks do not affect the display.

Code for reproduction

importmatplotlib.pyplotaspltfig,ax=plt.subplots()ax.imshow([[1,2],[3,4]])ax.set(yticks=[0,1])# change the display in 1.3.1

outcome in 3.1.1

Previous outcome in 3.1.0

Matplotlib version

• Operating system: Linux
• Matplotlib version: 3.1.0 / 3.1.1
• Matplotlib backend: module://ipykernel.pylab.backend_inline
• Python version: 3.7.3