[Bug]: can not set ylabel fontsize in host_subplot

[BHM-Bob]

Bug summary

can not set ylabel fontsize in host_subplot with ax.set_ylabel
matplotlib==3.7.5

Code for reproduction

# normal plot
fig, ax1 = plt.subplots(figsize = (10, 8))
ax1.bar([1, 2, 3], [1, 2, 3], color = 'black')
ax1.set_ylabel('ylabel', fontsize = 20)
plt.suptitle('subplots fontsize=20', fontsize = 20)
plt.title('subplots fontsize=10', fontsize = 10)
plt.show()

# host_subplot
ax2 = host_subplot(111, axes_class=axisartist.Axes)
ax2.figure.set_size_inches((10, 8))
ax2.bar([1, 2, 3], [1, 2, 3], color = 'black')
ax2.set_ylabel('ylabel', fontsize = 20) # this code does not work
# ax2.axis['left'].label.set_fontsize(20) # this code works
plt.suptitle('host_subplot fontsize=20', fontsize = 20)
plt.title('host_subplot fontsize=10', fontsize = 10)
plt.show()

Actual outcome

ax2 has ylabel and it's font size is NOT 20 as ax1

Expected outcome

ax2 has ylabel and it's font size is 20 as ax1

Additional information

ax2.set_ylabel('ylabel', fontsize = 20) # this code does not work
# ax2.axis['left'].label.set_fontsize(20) # this code works

Operating system

windows10

Matplotlib Version

3.7.5

Matplotlib Backend

TkAgg

Python version

Python 3.8.10

Jupyter version

No response

Installation

pip

[anntzer]

This occurs because axis_artist.AxisLabel copies (via the AttributeCopier mechanism) the text string (and the color) from the actual axis.label Text object (the "ref_artist"), but not the fontproperties. I suspect the fix involves making more properties go through AttributeCopier. (OTOH the whole thing seems a bit brittle...)