Bug summary

When investigating #31106 I was trying different backends to see if I could reproduce the behaviour in backends that are not MacOSX.

When testing the TkAgg backend I came across a similar issue. When trying to close the window (not a tab) the window stays open and cannot be interacted with. Hovering over the window prompts a "spinning wheel" (ergo a "zombie" window versus a "ghost" window as this window is not see-through). However unlike the bug in #31106, opening a new figure/window clears the old one.

However this only happens in an ipython session, not in a python interactive session.

I cannot verify if this is new as of MacOSX 26 since I was not using the TkAgg backend prior to this. Similarly I have not tried this on other OSes, so the two bugs could be coincidentally similar.

Code for reproduction

import matplotlib
matplotlib.rcdefaults()
matplotlib.use('TkAGG')
from matplotlib import pyplot
figure = pyplot.figure()
figure = pyplot.figure()
pyplot.show()

Actual outcome

Expected outcome

Window should close.

Additional information

I also reproduce the bug with:

ipython     8.18.1   pyh707e725_3        577.19 KiB  conda  https://conda.anaconda.org/conda-forge
matplotlib  3.9.4    py39hdf13c20_0       16.60 KiB  conda  https://conda.anaconda.org/conda-forge
python      3.9.23   h7139b31_0_cpython   10.47 MiB  conda  https://conda.anaconda.org/conda-forge

Operating system

MaxOSX 26.2

Matplotlib Version

3.10.8

Matplotlib Backend

TkAgg

Python version

3.14.3

Jupyter version

No response

Installation

pixi