Bug report

Bug summary

Adding hatches results in a change in the face color of bars. The problem occurs when saved as PDF. Everything is ok with png.

Code for reproduction

import matplotlib.pyplot as plt

fig, ax = plt.subplots()
ax.barh(2, 4, edgecolor='black', facecolor='green', alpha=0.3)
ax.barh(3, 4, edgecolor='black', facecolor='green', hatch='///', alpha=0.3)
fig.savefig('hbarplot.pdf')
fig.savefig('hbarplot.png')

Actual outcome

Expected outcome

The plot in the pdf file to be the same as the one in png file.

Matplotlib version

• Operating system: Windows 10
• Matplotlib version: 3.0.3, conda, default
• Matplotlib backend (print(matplotlib.get_backend())): Qt5Agg or module://ipykernel.pylab.backend_inline (problem occurs with both)
• Python version: 3.7