Bug summary

All's in the title.

Code for reproduction

# Run this from a computer with a hidpi display.
from pylab import *; import pickle
fig = figure(figsize=(5, 4))
show(block=False)
copy = pickle.loads(pickle.dumps(fig))
show(block=False)
print(fig.get_size_inches(), c.get_size_inches())

Actual outcome

[5. 4.] [10. 8.]
... and the second figure is indeed twice bigger.

Expected outcome

[5. 4.] [5. 4.]
... and two figures with the same size.

Additional information

Bisects to #23476.

Operating system

macOS

Matplotlib Version

3.8

Matplotlib Backend

qtagg

Python version

3.12

Jupyter version

ENOSUCHLIB

Installation

git checkout