Bug report

Bug summary

The very top and bottom of the heatmaps are getting truncated to 1/2 height in version 3.1.1. This does not happen for version 3.0.3.

This is the code from a Jupyter Notebook

import matplotlib
import pandas as pd
import numpy as np
import seaborn as sb
%pylab inline

print(matplotlib.__version__)
print(sb.__version__)

grid = pd.DataFrame(np.arange(9).reshape((3,3))/10)
fig, ax = subplots(1, 1, figsize=(5, 5))

sb.heatmap(grid, annot=True, fmt=".0f", ax=ax, cmap='RdBu',  vmin=0, vmax=1, cbar=True);

Actual outcome

Populating the interactive namespace from numpy and matplotlib
3.1.1
0.9.0

Matplotlib version

• Operating system: Ubuntu Linux
• Matplotlib version: 3.1.1
• Matplotlib backend: module://ipykernel.pylab.backend_inline
• Python version: 3.6
• Jupyter version (if applicable): 4.4.0
• Other libraries: