fix: replace all escaped \n with an actual \n character

[joshuaellis]

What does it do?

When our objects are stringified they're parsed so the \n becomes \\n, which means when it's parsed, it's no longer recognised as a line-break character, instead it's recognised as a \ and n separately. This PR replaces those string sections, with the line-break character again.

Why is it needed?

IMO it's a little confusing because \n isn't strictly markdown and if people use <br> instead, everything works fine. But this solution does solve the issue brought up by the community.

How to test it?

• Add richtext content field to a content type
• Set a default value of something like hello\nthere
• Create new content entry based on initial type
• Select preview mode
• There should be a line break.

This will also work if you type out line breaks in the editor itself.

Related issue(s)/PR(s)

• resolves Default value field strips newlines #13093

[strapi-cla]

All committers have signed the CLA.

[codecov]

Codecov Report

Base: 57.47% // Head: 57.47% // No change to project coverage 👍

Coverage data is based on head (4a15d9f) compared to base (8ebf58d).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #14454   +/-   ##
=======================================
  Coverage   57.47%   57.47%           
=======================================
  Files        1263     1263           
  Lines       30775    30775           
  Branches     5772     5772           
=======================================
  Hits        17689    17689           
  Misses      11253    11253           
  Partials     1833     1833           

Flag	Coverage Δ
front	61.09% <100.00%> (ø)
unit	49.19% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...content-manager/components/PreviewWysiwyg/index.js	100.00% <100.00%> (ø)

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[ronronscelestes]

mmh so codemirror automatically escaping any \ by replacing it with \\ but then we reverse it for preview with markdown it? 👀
works well though well done!

[joshuaellis]

mmh so codemirror automatically escaping any \ by replacing it with \\ but then we reverse it for preview with markdown it? 👀 works well though well done!

It seems to be when the value is part of an action dispatched that it's serialized along the way & then it's put in the store, but the same is to be said when we get the default value from the API response on initial launch, CodeMirror doesn't really do much in this case I believe.

[ronronscelestes]

LGTM - nice catch 💃