Single newlines in Markdown are rendered as hard line breaks instead of spaces

[kercsoj]

We write our documentation as plain Markdown files and then use the GitHub Sync plugin to synchronize them with GitBook.

The problem is that when the Markdown wrapped (eg at 80 characters) — using single line breaks within a paragraph — GitBook’s renderer treats every newline as a hard break (<br>), rather than the CommonMark-compliant behavior of treating a single newline as a space and only a blank line (two consecutive newlines) as a paragraph break. This results in documentation that looks broken.

Here are two examples from two different websites which uses Gitbook:

Source: https://docs.bucket.co/supported-languages/browser-sdk/globals

Source: https://developerdocs.instructure.com/services/canvas

So a if I have a Markdown file like:

This is a very long line.  This is a very long line. This is a very long line. This is a very long line. This is a very long line. This is a very long line. This is a very long line.  This is a very long line. This is a very long line. This is a very long line. This is a very long line. This is a very long line.

This is a short line.
This is a short line.
This is a short line.
This is a short line.
This is a short line.

It should be rendered as:

This is a very long line. This is a very long line. This is a very long line. This is a very long line. This is a very long line. This is a very long line. This is a very long line. This is a very long line. This is a very long line. This is a very long line. This is a very long line. This is a very long line.

This is a short line. This is a short line. This is a short line. This is a short line. This is a short line.

Instead of

This is a very long line. This is a very long line. This is a very long line. This is a very long line. This is a very long line. This is a very long line. This is a very long line. This is a very long line. This is a very long line. This is a very long line. This is a very long line. This is a very long line.

This is a short line.
This is a short line.
This is a short line.
This is a short line.
This is a short line.

I don't remember seeing this issue in earlier versions of Gitbook. Did anyone experienced similar issue? How did you manage to solve it?

Thanks,
Jozsef