Bug report

Bug summary

All's in the title.

Code for reproduction

from matplotlib import use; use("qt5agg")
from pylab import *
rcParams["toolbar"] = "toolmanager"
plot()
show()

Actual outcome

press e.g. "s", nothing happens

Expected outcome

relevant tool (in this case, "save figure") is triggered

Matplotlib version

• Operating system: linux
• Matplotlib version: 2.2
• Matplotlib backend (print(matplotlib.get_backend())): qt5agg
• Python version: 3.6
• Jupyter version (if applicable): N/A
• Other libraries: