Bug report

Bug summary

Rocket icon appears in dock (and bounces) when matplotlib.pyplot is imported after installing matplotlib 3.0. In previous versions, this didn't happen (and still doesn't with python2 on the same machine)

Code for reproduction

import matplotlib.pyplot 

Actual outcome
Rocket icon appears in MacOS dock and bounces for a while.

Expected outcome
Nothing (no dock icon for previous versions).

Matplotlib version

• Operating system: MacOS
• Matplotlib version: 3
• Matplotlib backend: any (seems to happen no matter what is set in matplotlibrc)
• Python version: 3.7 (Python.org framework build)

Installed from pip.

I haven't seen any other complaints about this, so I suspect that there is something specific to my setup.

Perhaps related to this ipython issue (but this happens even from the plain python3 REPL.) I