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This PR - Introduces multiline markdown transformers / mdx support - Introduce `shouldMergeAdjacentLines` option in `$convertFromMarkdownString`. If true, merges adjacent lines as per commonmark spec. This would allow to close: https://github.com/payloadcms/payload/issues/8049 - Many new features and bug fixes! - Ports over changes from the lexical playground. Most notably: - add support for enabling table row stripping - make table resizing & table cell selection more reliable **BREAKING**: This upgrades lexical from 0.17.0 to 0.18.0. If you have any lexical packages installed in your project, please update them accordingly. Additionally, if you depend on the lexical APIs, please consult their changelog, as lexical may introduce breaking changes: https://github.com/facebook/lexical/releases/tag/v0.18.0 --------- Co-authored-by: Alessio Gravili <alessio@gravili.de>