Jupytext

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**Changed**
- The test suite filters the warnings that don't belong to Jupytext ([823](https://github.com/mwouts/jupytext/issues/823))

**Fixed**
- The parsing of notebooks that don't have a YAML header (like `docs/formats.md`) was improved.
- The test suite works with `pytest-randomly` ([838](https://github.com/mwouts/jupytext/issues/838))

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**Changed**
- The "Jupytext Notebook" factory that lets the user configure the Notebook viewer as the default for text notebooks accepts more filetypes: "myst", "r-markdown" and "quarto" ([803](https://github.com/mwouts/jupytext/issues/803))
- Empty MyST Markdown files are valid notebooks ([883](https://github.com/mwouts/jupytext/issues/883))
- Jupytext also works with `markdown-it-py` v2.0 ([885](https://github.com/mwouts/jupytext/issues/885))

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**Changed**
- The extension for Jupyter Lab benefited from a series of improvements contributed by [Frédéric Collonval](https://github.com/fcollonval):
- A new "Jupytext Notebook" factory offers the option to open text notebooks directly with the notebook view ([803](https://github.com/mwouts/jupytext/issues/803)). To use it, follow the instructions in the [documentation](https://github.com/mwouts/jupytext/blob/main/docs/index.md#Install).
- The ICommandPalette is optional, for compatibility with RISE within JupyterLab [RISE[605](https://github.com/mwouts/jupytext/issues/605)](https://github.com/damianavila/RISE/pull/605)
- Added support for translation
- Branch `master` was renamed to `main` (links in the documentation were updated)

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**Fixed**
- The magic commands in `py:percent` scripts with no explicit format information remain commented over a round trip ([848](https://github.com/mwouts/jupytext/issues/848))

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**Added**
- The Jupytext CLI has a new `--diff` command to show the differences between two notebooks (and if you want to see the changes in a file being updated by Jupytext, use `--show-changes`) ([799](https://github.com/mwouts/jupytext/issues/799))
- Jupyter will show the diff between text and `ipynb` paired notebooks when it cannot open a paired notebook because the `ipynb` version is more recent. Also, if the inputs in the two files are identical then the notebook will open with no error ([799](https://github.com/mwouts/jupytext/issues/799))
- The `py:percent` format will use raw strings when encoding Markdown cells as string, if they contain backslash characters ([836](https://github.com/mwouts/jupytext/issues/836))

**Fixed**
- We have upgraded the jupyterlab extension dependencies and especially `ansi-regex` to fix a security vulnerability ([857](https://github.com/mwouts/jupytext/issues/857))

**Changed**
- The Jupytext configuration file is reloaded only when a notebook is opened, saved, or when a different folder is explored ([797](https://github.com/mwouts/jupytext/issues/797))

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**Added**
- Jupytext supports Quarto notebooks (with `.qmd` extension) ([837](https://github.com/mwouts/jupytext/issues/837))
- Jupytext can be configured through the `pyproject.toml` file. Thanks to Robin Brown for this contribution! ([828](https://github.com/mwouts/jupytext/issues/828))
- Jupytext now supports OCaml files with `.ml` extension. Thanks to Quentin Fortier for getting this started ([832](https://github.com/mwouts/jupytext/issues/832))

**Fixed**
- Added more test to make sure that notebooks can be trusted. In practice, notebooks could not be trusted in JupyterLab<3.0.13 because of the absence of cell ids ([826](https://github.com/mwouts/jupytext/issues/826))