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[Bug]: subfigure artists not drawn interactively #28384

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@rcomer

Description

@rcomer

Bug summary

When artists are added to a subfigure in interactive mode, they do not appear until I force a draw by resizing the window.

Code for reproduction

$ ipython --matplotlib=qt
Python 3.12.3 | packaged by conda-forge | (main, Apr 15 2024, 18:38:13) [GCC 12.3.0]
Type 'copyright', 'credits' or 'license' for more information
IPython 8.24.0 -- An enhanced Interactive Python. Type '?' for help.

In [1]: import matplotlib.pyplot as plt

In [2]: fig = plt.figure()

In [3]: sfig1, sfig2 = fig.subfigures(ncols=2)

In [4]: sfig2.suptitle("My Title")
Out[4]: Text(0.5, 0.98, 'My Title')

In [5]: ax = sfig1.subplots()

In [6]: ax.plot([1, 3, 2])
Out[6]: [<matplotlib.lines.Line2D at 0x73a220908ce0>]

Actual outcome

Apparently empty figure
image

Expected outcome

If I resize the window, the artists appear
image

Additional information

No response

Operating system

Ubuntu

Matplotlib Version

main

Matplotlib Backend

QtAgg and TkAgg

Python version

3.12.3

Jupyter version

No response

Installation

git checkout

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