Converting a code block with newlines to a paragraph creates a paragraph with newlines

[marijnh]

Which are visible, but then normalized back to spaces as soon as you type something and the paragraph is re-parsed.

Ideally, the newlines should be converted to hard breaks when the textblock type is changed, though it's going to be kind of tricky to find a reasonable place for that code (it's very schema-specific).

Via ProseMirror/prosemirror-markdown#26

[m-gallesio]

Please note this problem still exists and is not unique to code blocks:

This also happens when the editor is initialized with a text already containing newlines (e.g. fetched from remote).

[m-gallesio]

After some testing, a preliminary consumer-level solution can be preprocessing the data:

• plain text to rich text: convert any newline to double newlines
• rich text to plain text: convert double newlines to single newlines

Again, this is tentative but it fits our use case (we are not interested in preserving the difference between the various type of line breaks).

[m-gallesio]

@marijnh As a reminder, for prosemirror-markdown there already seems to be a fix available introduced at latest here: ProseMirror/prosemirror-markdown@20905b3 which makes it possible to override the default parser's behaviour when parsing soft breaks. In our use case it seems to work fine.