Empty axes on draw after blitted animation finishes #12528

Bug report

Bug summary

When using blitting in an animation the figure window can be resized and the plot can be zoomed without problem while the animation is running.
However after the animation finishes (repeat=False), the content is not redrawn to the canvas and the axes become empty on zooming/panning/resizing.

This issue was raised on Stackoverflow: https://stackoverflow.com/questions/52806527/how-can-i-keep-the-last-frame-when-i-use-matplotlib-animation-function-with-blit

Code for reproduction

Code taken from the simple animation example and adapted to use repeat=False and equipped with a callback to print the line visibility.

import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation

fig, ax = plt.subplots()

x = np.arange(0, 2*np.pi, 0.01)
line, = ax.plot(x, np.sin(x))

def init():  # only required for blitting to give a clean slate.
    line.set_ydata([np.nan] * len(x))
    return line,

def animate(i):
    line.set_ydata(np.sin(x + i / 100.))  # update the data.
    return line,

ani = animation.FuncAnimation(
    fig, animate, init_func=init, frames=100, interval=20, blit=True, repeat=False)

def ondraw(evt):
    print(line.get_visible())

fig.canvas.mpl_connect("draw_event", ondraw)

plt.show()

To reproduce, wait till the animation finishes, then resize the window or zoom or pan in the axes.

Actual outcome

An empty axes after zooming, panning, resizing.
Even though the connected ondraw callback prints True for the visibility of the line througout.

Expected outcome

The line should be visible.

Matplotlib version

• Operating system: Win8
• Matplotlib version: 2.0.2, 3.0.0
• Matplotlib backend (print(matplotlib.get_backend())): Qt5Agg
• Python version: 3.6