Bug report

Bug summary

Not sure if this an expected behaviour, but the colorbar seems to be ignored when usingtight_layout. Example taken from the "Constrained Layout Guide" (https://matplotlib.org/3.1.3/tutorials/intermediate/constrainedlayout_guide.html#colorbars).

Code for reproduction

arr=np.arange(100).reshape((10,10))fig,axs=plt.subplots(2,2,figsize=(4,4),constrained_layout=True)foraxinaxs.flat:im=ax.pcolormesh(arr)fig.colorbar(im,ax=axs,shrink=0.6)plt.tight_layout()

Actual outcome

Expected outcome
This is the outcome before callingplt.tight_layout()

Matplotlib version

• Operating system: Fedora 31
• Matplotlib version: 3.1.3 from conda defaults (3.2.1 from conda-forge behave similarly)
• Matplotlib backend (print(matplotlib.get_backend())): Qt5Agg
• Python version: 3.7.6
• Jupyter version (if applicable):
• Other libraries: