Bug report

Bug summary

It appears thatstackplot fails for small numbers in version 3.2.1, or at least something goes wrong in my clean installation, see figures below.

Code for reproduction

importnumpyasnpimportmatplotlib.pyplotaspltx=  [0,1]y1=1e-8*np.ones_like(x)y2=1e-9*np.ones_like(x)fig,axs=plt.subplots(2,1)axs[0].stackplot(x,y1,y2)# This plot is fineaxs[1].stackplot(x,y1/10,y2/10)# This plot is wrongplt.show()

Actual outcome

Something went wrong in the second subplot.

Expected outcome
Expected this, as generated withmatplotlib version 3.1.2

Matplotlib version

• Operating system: macOS 10.12.6 (Sierra)
• Matplotlib version: 3.2.1
• Matplotlib backend (print(matplotlib.get_backend())): MacOSX
• Python version: 3.8.3

Created a conda environment with only thenumpy package, then installed matplotlib withpip.