Line breaks lost in code blocks after using tryParseHTMLToBlocks and replaceBlocks

[hughes-hc]

Describe the bug
When I try to convert an HTML string containing <code> blocks into BlockNote blocks using tryParseHTMLToBlocks, and then replace the current blocks using replaceBlocks, all the line breaks inside the code blocks are lost and replaced with spaces. This causes multi-line code to appear as a single line, breaking formatting and readability.

To Reproduce

github-vamzb28v (1).zip

Misc

• Node version: 22.0
• Package manager: pnpm
• Browser: chrome
• I'm a sponsor and would appreciate if you could look into this sooner than later 💖

[nperez0111]

When the editor writes out HTML, it uses <br> tags to represent newlines, as seen here:

This would round-trip properly, and is more explicit on what is happening.

Though, I do understand that we should probably be a bit more lenient in what we parse, so I will create a PR which adds this more lenient parsing behavior.

[nperez0111]

@matthewlipski can I ask you to take over this PR by adding some tests for this new behavior to make sure we don't regress in the future?