Long-term code block (address line break issues)

[justintadlock]

Currently, we are using the Code Syntax Block for the Developer Blog, which extends the Core Code block. When setting a "Language" for this block in the editor, it adds <br> tags instead of \n within the code.

<br> tags are perfectly fine within <pre><code>. Nested HTML is valid here.

However, the plugin uses Prism.js, which strips HTML within code elements. And because the plugin is using <br> instead of \n, it behaves as there are no line breaks at all. So, on the front end, all the code is formatted into a single line.

There is a "Keep Markup" JS extension that may also be a front-end fix for the plugin: https://prismjs.com/plugins/keep-markup/

What we've been doing:

We've had to manually search/replace <br> tags in the editor and replace them with \n.

Short-term fix:

We have a temporary solution for the plugin here: #61

Longer term:

We need a more robust solution that:

1. Respects valid HTML within code blocks.
2. Consistently handles line breaks.

This could be forking the current plugin, submitting a patch to it, or picking another plugin (potentially needing to fix too).

Related history:

This initially became an issue when Gutenberg started adding <br> tags. However, this has now been addressed in Gutenberg: WordPress/gutenberg#59627

[juanmaguitar]

It seems that the latest version of Code Syntax Block v3.2.0 has solved this issue, which has already been updated in the Developer Blog.