Test for https://github.com/jupyterlab/jupyterlab/issues/8734

Test.ipynb

{"metadata":{"kernelspec":{"display_name":"Python 3","language":"python","name":"python3"},"language_info":{"codemirror_mode":{"name":"ipython","version":3},"file_extension":".py","mimetype":"text/x-python","name":"python","nbconvert_exporter":"python","pygments_lexer":"ipython3","version":"3.7.8"}},"nbformat_minor":5,"nbformat":4,"cells":[{"cell_type":"code","source":"from IPython.display import display, Markdown","metadata":{"trusted":true},"execution_count":1,"outputs":[]},{"cell_type":"code","source":"string = '|Nom et Netlist|Inconnues|Stamp|RHS|   \\n|:-:|:-:|:-:|:-:|   \\n|Générateur de tension<br>  ```Vx N+ N- Vg```|$\\\\left[\\\\begin{matrix}V(N+)\\\\\\\\V(N-)\\\\\\\\I(Vx)\\\\end{matrix}\\\\right]$|$\\\\left[\\\\begin{matrix}0 & 0 & 1\\\\\\\\0 & 0 & -1\\\\\\\\1 & -1 & 0\\\\end{matrix}\\\\right]$|$\\\\left[\\\\begin{matrix}0\\\\\\\\0\\\\\\\\V_{g}\\\\end{matrix}\\\\right]$|   \\n'","metadata":{"trusted":true},"execution_count":2,"outputs":[]},{"cell_type":"code","source":"something_that_can_change = ''\ndisplay(Markdown(string + something_that_can_change))","metadata":{"trusted":true},"execution_count":3,"outputs":[{"output_type":"display_data","data":{"text/plain":"<IPython.core.display.Markdown object>","text/markdown":"|Nom et Netlist|Inconnues|Stamp|RHS|   \n|:-:|:-:|:-:|:-:|   \n|Générateur de tension<br>  ```Vx N+ N- Vg```|$\\left[\\begin{matrix}V(N+)\\\\V(N-)\\\\I(Vx)\\end{matrix}\\right]$|$\\left[\\begin{matrix}0 & 0 & 1\\\\0 & 0 & -1\\\\1 & -1 & 0\\end{matrix}\\right]$|$\\left[\\begin{matrix}0\\\\0\\\\V_{g}\\end{matrix}\\right]$|   \n"},"metadata":{}}]},{"cell_type":"code","source":"something_that_can_change=' \\n\\n``` \\ndef a():\\nprint(\"hello\")\\n```'\ndisplay(Markdown(string + something_that_can_change))","metadata":{"trusted":true},"execution_count":4,"outputs":[{"output_type":"display_data","data":{"text/plain":"<IPython.core.display.Markdown object>","text/markdown":"|Nom et Netlist|Inconnues|Stamp|RHS|   \n|:-:|:-:|:-:|:-:|   \n|Générateur de tension<br>  ```Vx N+ N- Vg```|$\\left[\\begin{matrix}V(N+)\\\\V(N-)\\\\I(Vx)\\end{matrix}\\right]$|$\\left[\\begin{matrix}0 & 0 & 1\\\\0 & 0 & -1\\\\1 & -1 & 0\\end{matrix}\\right]$|$\\left[\\begin{matrix}0\\\\0\\\\V_{g}\\end{matrix}\\right]$|   \n \n\n``` \ndef a():\nprint(\"hello\")\n```"},"metadata":{}}]},{"cell_type":"code","source":"something_that_can_change=' \\n\\n```python \\ndef a():\\nprint(\"hello\")\\n```'\ndisplay(Markdown(string + something_that_can_change))","metadata":{"trusted":true},"execution_count":5,"outputs":[{"output_type":"display_data","data":{"text/plain":"<IPython.core.display.Markdown object>","text/markdown":"|Nom et Netlist|Inconnues|Stamp|RHS|   \n|:-:|:-:|:-:|:-:|   \n|Générateur de tension<br>  ```Vx N+ N- Vg```|$\\left[\\begin{matrix}V(N+)\\\\V(N-)\\\\I(Vx)\\end{matrix}\\right]$|$\\left[\\begin{matrix}0 & 0 & 1\\\\0 & 0 & -1\\\\1 & -1 & 0\\end{matrix}\\right]$|$\\left[\\begin{matrix}0\\\\0\\\\V_{g}\\end{matrix}\\right]$|   \n \n\n```python \ndef a():\nprint(\"hello\")\n```"},"metadata":{}}]}]}