Bug report

Bug summary

The savefig.transparent rcparam does not affect figures saved from the GUI.

Code for reproduction

from pylab import *
rcParams["savefig.transparent"] = True
plot()
show()

then click on the save button to save a figure.

Actual outcome

The figure has opaque background.

Expected outcome

The figure should have transparent background, just as it has when calling savefig().

Matplotlib version

• Operating System:
• Matplotlib Version: 2.0.2 but apparently dates back to at least 1.5.0.
• Python Version:
• Jupyter Version (if applicable):
• Other Libraries: