Bug report

Bug summary: When calling plt.ginput, the icon for the graphics library (Qt5 for my case) will appear, but the actual plot does not appear, making it impossible to select icons. Other plt calls like plt.show() work fine. This issue is absent on 2.0.2.

I've confirmed that the changes in #8305 are the issue; reverting those changes manually fixes the problem. However, since it looks like that PR fixed another issue; I'm not sure what the right thing to do is.

Code for reproduction: See https://matplotlib.org/examples/pylab_examples/ginput_demo.html without the final line:

import matplotlib.pyplot as plt
import numpy as np

t = np.arange(10)
plt.plot(t, np.sin(t))
print("Please click")
x = plt.ginput(3)
print("clicked", x)

Matplotlib version

• Operating system: macOS 10.13.1
• Matplotlib version: 2.1.0
• Matplotlib backend (print(matplotlib.get_backend())): Qt5Agg (also tried TkAgg)
• Python version: 3.6.3 (installed via Homebrew)