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raw.plot(block=True) freezes the jupyter kernel forever #6528

@wmvanvliet

Description

@wmvanvliet

Describe the bug

When plotting continuous "raw" data and specify block=True, everything works well until you try to close the figure. Control is never handed back to the command line. This does not occur when using command line ipython, but does occur when using Spyder or a Jupyter notebook.

Steps and/or code to reproduce

In Spyder or a notebook:

import mne
data_path = mne.datasets.sample.data_path()
raw = mne.io.read_raw_fif(data_path +'/MEG/sample/sample_audvis_raw.fif')
raw.plot(block=True)

Close the plotting window. The Jupyer kernel now hangs.

Expected results

After closing the window, the Jupyter kernel should become responsive again.

Actual results

Jupyter kernel never becomes responsive.

Additional information

Platform:      Linux-4.4.0-148-generic-x86_64-with-debian-stretch-sid
Python:        3.6.8 |Anaconda, Inc.| (default, Dec 30 2018, 01:22:34)  [GCC 7.3.0]
Executable:    /work/modules/Ubuntu/14.04/amd64/common/anaconda3/latest/envs/neuroimaging/bin/python
CPU:           x86_64: 8 cores
Memory:        15.6 GB

mne:           0.18.1 (also tested this on current master)
numpy:         1.16.4 {blas=mkl_rt, lapack=mkl_rt}
scipy:         1.2.1
matplotlib:    3.1.0 {backend=Qt5Agg}

sklearn:       0.21.2
nibabel:       2.4.1
mayavi:        4.6.2 {qt_api=pyqt5, PyQt5=5.9.2}
cupy:          Not found
pandas:        0.24.2
dipy:          Not found

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