Bug report

Bug summary

When using Matplotlib 1.5.3 in iPython with the TkAgg backend, control is not returned to iPython after showing a plot and closing the window.

Code for reproduction

In [1]: import matplotlib as mpl

In [2]: mpl.use('TkAgg')

In [3]: import matplotlib.pyplot as plt

In [4]: plt.plot([0, 1])
Out[4]: [<matplotlib.lines.Line2D at 0x7fb09f2a0350>]

In [5]: plt.show()

Actual outcome

Closing the window does not return control to iPython

Matplotlib version

• Operating System: Linux
• Matplotlib Version: 1.5.3
• Python Version: 2.7
• Other Libraries: iPython 4.1.2, but it happens with other versions too.

Installed via conda via conda-forge channel

The issue doesn't occur in 2.0. Are there likely to be any more 1.5 point releases?