Bug summary

If you use the "save" button on Qt after the save the window is blank until a redraw is forced (resize the window, pan/zoom by guessing where the axes were, etc).

Code for reproduction

import matplotlib
import matplotlib.pyplot as plt

matplotlib.use('qtagg')
plt.plot(range(5))
plt.show()

# click the save button

Actual outcome

Expected outcome

Additional information

• see it with both blocking and non-blocking show()
• do not see it with tk (did not test other GUI frameworks)

I think this is a blocker for 3.8 as Qt is the backend a lot of people end up using (because it is the first in our list and conda install pyqt as a Matplotlib dependency)

Operating system

Arch

Matplotlib Version

3.8.0.dev1477+gb274f78060 (~main)

Matplotlib Backend

QtAgg (with pyqt6)

Python version

Python 3.13.0a0 (it is actually a branch from a PR)

Jupyter version

NA

Installation

git checkout