Bug summary

There seems to be an issue when trying to plot quivers in the axes created within subfigures.

Code for reproduction

import matplotlib.pyplot as plt
fig = plt.figure()
subfigs = fig.subfigures(1, 2)
axsLeft = subfigs[0].subplots(1, 2)
axsLeft[0].quiver(1,1,1,1)

Actual outcome

Traceback (most recent call last):
File "", line 1, in
File "/home/hyzhou/.local/lib/python3.8/site-packages/matplotlib/init.py", line 1361, in inner
return func(ax, *map(sanitize_sequence, args), **kwargs)
File "/home/hyzhou/.local/lib/python3.8/site-packages/matplotlib/axes/_axes.py", line 5117, in quiver
q = mquiver.Quiver(self, *args, **kw)
File "/home/hyzhou/.local/lib/python3.8/site-packages/matplotlib/quiver.py", line 510, in init
self._cid = ax.figure.callbacks.connect('dpi_changed', on_dpi_change)
AttributeError: 'SubFigure' object has no attribute 'callbacks'

Expected outcome

Expect the same outcome as

fig, ax = plt.subplots(1, 2,)
ax[0].quiver(1,1,1,1)

Additional information

No response

Operating system

Ubuntu

Matplotlib Version

3.4.3

Matplotlib Backend

No response

Python version

3.8.5

Jupyter version

No response

Installation

No response