Bug report

A 3D line plot is created and pickled for reloading later. Loading the plot later results in a plot that cannot be interacted with.

Code for reproduction

import matplotlib.pyplot as pltfrom mpl_toolkits.mplot3d import Axes3Dimport pickle as pkimport numpy as npplt.ioff()t = np.linspace(0, 6*np.pi, 1000)x = np.sin(t)y = np.cos(t)z = t/100fig = plt.figure()ax = fig.add_subplot(111, projection='3d')ax.plot(x, y, z, label='3d plot')fo = open('test_file.pkl', 'wb')pk.dump(fig, fo)fo.close()

In a different python instance

import matplotlib.pyplot as pltfrom mpl_toolkits.mplot3d import Axes3Dimport pickle as pkplt.ioff()fi = open('test_file.pkl', 'rb')fig = pk.load(fi)fi.close()fig.show()

The figure is shown, but cannot be interacted with.

Expected outcome
The figure would be shown and the plot could be interacted with to show a different view.

Matplotlib version

• Operating system: Win7
• Matplotlib version: 2.1.2
• Matplotlib backend: Qt5Agg
• Python version: 3.6.4
• Jupyter version (if applicable): N/A
• Other libraries: iPython 6.2.1, Spyder 3.2.6

matplotlib installed by Anaconda from default channel.