MacOSX backend not closing properly

[cimarronm]

MacOSX backend does not seem to be closing properly when plot windows are closed.

import matplotlib.pyplot as plt

plt.plot(range(10))
plt.show()
print("Won't reach here")
plt.plot(range(20))
plt.show()

The python script will halt after the first plt.show() even after closing the plot windows. Problem seems to be that the backend NSApp is not quitting and is not returning back from show().

[cimarronm]

This appears to have started with PR #4006.

@mdehoon, do you want to see if you can reproduce on your system and it is not just an issue with my setup? I see the problem running on python 3.4.2.

[cimarronm]

Also, I don't see any issues if run under ipython or if ion() is set

[mdehoon]

Indeed this was caused by some code getting inadvertently lost in pull request 4006.
See pull request 4144 (#4144) for a fix.