Bug report

Bug summary

Plot not being displayed using notebook toolkit on the output widget depending on order of output.

Code for reproduction

cell 1:

%matplotlib notebook
from matplotlib import pyplot as plt
import ipywidgets as wg

cell 2:

test_out = wg.Output()
display(test_out)
with test_out:
    plt.figure()
    plt.plot([1,2,3])

cell 3:

test_out = wg.Output()
with test_out:
    plt.figure()
    plt.plot([1,2,3])
display(test_out)

Actual outcome

Expected outcome

same output for cell 3 as cell 2:

Matplotlib version

• Operating system: win
• Matplotlib version: 3.0.2
• Matplotlib backend : nbAgg
• Python version: Python 3.7.1
• Jupyter version (if applicable): 5.7.4
• Other libraries: ipywidgets 7.5.1