Fixes line breaks in paragraphs

[martin-lysk]

This pr introduces a serailization that allows to serailize whitespaces comming from plate lossless into markdown.

Markdown whitespace handling is a beast - two \n represent a paragraph but following ones get collapsed.

Mardkown	Gets rendered as
Hello new paragraph	Hello new paragraph

empty paragraph	paragraph with one softbreak	paragraph with two softbreak
Hello new paragraph	Hello new paragraph	Hello new paragraph
Hello <br /> new paragraph	Hello <p><br /></p> new paragraph	Hello \ <br /> new paragraph

Checklist

• yarn typecheck
• yarn lint:fix
• yarn test
• yarn brl
• yarn changeset
• ui changelog

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[changeset-bot]

🦋 Changeset detected

Latest commit: 4ad877f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@udecode/plate-markdown	Patch
@udecode/plate-ai	Patch

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Name	Status	Preview	Comments	Updated (UTC)
plate	❌ Failed (Inspect)			Apr 16, 2025 3:59pm

[martin-lysk]

This PR is still in draft - see discussion https://discord.com/channels/1026227597115396188/1080907882960277566/1361294241975767110

[12joan]

Test

 

Test



Test

 

Test

X
Y

Test

[martin-lysk]

Paragraph with various soft linebreaks:

<br />br before the first non whitespace character  
Linebreak after first non whitespace Character  
The last softbreak:<br />&nbsp;

br before the first non whitespace character
Linebreak after first non whitespace Character
The last softbreak:
 

"Empty" paragraph using <br />:

<br /> following paragraph

Empty paragraph using <br />&nbsp;:

 

<br />&nbsp; following paragraph

Empty paragraph <p></p>:

<p></p> following paragraph

Empty paragraph <p><br /></p>:

<p><br /></p> following paragraph

Empty paragraph  :

 

  following paragraph

Empty paragraph :



 following paragraph

Non Empty paragraph:

non empty

Non empty paragaph following paragraph