\n in mo.md literally interperted in markdown mode

[dmadisetti]

Describe the bug

Clicking on the markdown mode cell button transforms the literal \n to a breakline

changing back

Environment

0.3.4

Code to reproduce

mo.md(
    r"""
    Some people denote Poisson's ratio as $n$, $\nu$, or even $\mathllap{}\cdot\mathllap{\alpha}$
    """
)

Breaks on the \nu

try it here:
https://marimo.app/l/z5epex

[fuenfundachtzig]

The problem seems to be caused by this line at the end of the dedent function itself.

#1038 proposes to switch to dedent-js which doesn't have this problem.