nbconvert to slides does not work with matplotlib svg

[tbarbette]

Describe the bug
Exporting a matplotlib plot in SVG in slides (with jupyter nbconvert) does not work.

To Reproduce
The minimal ipynb:

import matplotlib.pyplot as plt
import numpy as np

from IPython.display import set_matplotlib_formats
set_matplotlib_formats('svg')

ax = plt.figure(figsize=(8, 3))

plt.grid(visible=True, axis="y", linestyle="dashed", zorder=0)

fig = plt.hist(np.random.rand(10), bins=bins, rwidth=0.9, zorder=3,density = density)
plt.show()

jupyter nbconvert md1.ipynb --execute --to slides

Expected behavior
The graph renders in jupyter, and the graph should also be visible in the html slides.

Screenshots

It seems the content has been sanitized or so :

<div class="jp-RenderedSVG jp-OutputArea-output " data-mime-type="image/svg+xml">
  | b'<svg width="506.928125pt" height="222.954375pt">\n \n  \n   \n    \n    2022-09-15T17:25:21.942234\n    image/svg+xml\n    \n     \n      Matplotlib v3.5.2, https://matplotlib.org/\n     \n    \n   \n  \n \n \n  <style type="text/css">*{stroke-linejoin: round; stroke-linecap: butt}</style>\n \n \n  \n   \n  \n  \n   \n    \n   \n   \n    \n     \n      \n       \n      \n      \n       \n      \n     \n     \n      \n      \n       \n        \n       \n       \n      \n     \n    \n    \n     \n      \n       \n      \n     \n     \n      \n      \n       \n        \n       \n       \n      \n     \n    \n    \n     \n      \n       \n      \n     \n     \n      \n      \n       \n        \n       \n       \n      \n     \n

Desktop (please complete the following information):

• OS: Ubuntu on WSL
• Browser chrome
• Version

Selected Jupyter core packages...
IPython          : 7.31.1
ipykernel        : 6.7.0
ipywidgets       : 6.0.0
jupyter_client   : 7.1.2
jupyter_core     : 4.9.1
jupyter_server   : not installed
jupyterlab       : not installed
nbclient         : 0.5.6
nbconvert        : 7.0.0
nbformat         : 5.1.3
notebook         : 6.4.8
qtconsole        : 5.3.2
traitlets        : 5.1.1

[RRosio]

Hi @tbarbette, thank you for submitting this issue! We'll track this in the nbconvert issue jupyter/nbconvert#1863

[tbarbette]

Ah sorry for the duplicate !