Bad interaction between shared axes and pcolormesh sticky edges #16448

Bug report

Bug summary

The following example demoes (on master) a bad interaction between shared axes and pcolormesh sticky edges:

from pylab import *

Z = np.arange(15).reshape(3, 5)
x = np.arange(6)
y = np.arange(4)

fig, axs = plt.subplots(2, 2, sharex="col", sharey="col")
axs[0, 0].pcolormesh(x, y, Z)
axs[1, 1].pcolormesh(x, y, Z)

plt.show()

Effectively sticky edges are not applied on the bottom-right.

This bisects back to #13593 :-( so I guess this may be nice to fix in 3.2...

Matplotlib version

• Operating system:
• Matplotlib version: master
• Matplotlib backend (print(matplotlib.get_backend())):
• Python version:
• Jupyter version (if applicable):
• Other libraries: