Bug report

Bug summary

constrained_layout seems to place colorbars at the "extreme right" of the image. (not sure how to phrase this; see below)

Code for reproduction

f, ax = plt.subplots(2,2, constrained_layout=True)

data = np.random.randn(10, 10)
    
for aa in ax.flat:
    mappable = aa.pcolormesh(data)
    
f.colorbar(mappable, ax=ax[:, 0])

Actual outcome

Expected outcome

I would like the constrained_layout version of this --- which results when setting constrained_layout=False in the plt.subplots call above

Matplotlib version

• Operating system: Ubuntu 16.04
• Matplotlib version: 2.2.2
• Matplotlib backend (print(matplotlib.get_backend())): module://ipykernel.pylab.backend_inline
• Python version: 3.6.5
• Jupyter version (if applicable): 5.5.0
• Other libraries: