Bug report

Calling fig.show() on a figure doesn't block. Commenting out the input() line below does block, and the figure shows fine. Also using plt.show() instead works fine.

Code for reproduction

import matplotlib
matplotlib.use('qt5agg')
from matplotlib import pyplot as plt

fig, ax = plt.subplots()
fig.show()
# input()

Matplotlib version

• Operating system: MacOS
• Matplotlib version: 3.0.2
• Matplotlib backend (print(matplotlib.get_backend())): qt5agg
• Python version: 3.7.1