Bug report

Bug summary

The very top and bottom of the heatmaps are getting truncated to 1/2 height in version3.1.1. This does not happen for version3.0.3.

This is the code from a Jupyter Notebook

importmatplotlibimportpandasaspdimportnumpyasnpimportseabornassb%pylabinlineprint(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 matplotlib3.1.10.9.0

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: