Messed up entire markdown syntax

[vittorio-c]

Describe the bug

The app messed up the entire markdown syntax of my file.

To Reproduce

Steps to reproduce the behavior:

1. Create a markdown file in your regular markdown editor.
2. Add normal stuff like lists, break lines, code fences, math expressions.
3. Then open up your file in the "nextcloud/text" app and save the file.
4. Open back your file in your regular markdown editor, and see errors : all your makrdown syntax is entirely messed up :

• Backslash are added on every single math anotations.
• Break lines are removed.
• Lists '-' are replaced with '*'.
• '<' and '>' in URL are simply... removed.
• Langage indices (ex: 'python') in code fences are removed.

Is this normal behavior ? It sounds like the app is trying to avoid langage injection, or something like this. But I don't see why, since it's just regular file. There is no "excecution" capability in markdown file, isn't it ?

Expected behavior

None of my markdown syntax is touched.

Client details:

• OS: Linux Manjaro 5
• Browser: Firefox
• Device: Desktop

Text app version: 3.5.1

Web server: Nextcloud 24

[susnux]

Just as a user:

• Backslash are added on every single math anotations.

• Break lines are removed.

Sounds bad, probably a bug?

• Lists '-' are replaced with '*'.

the text-app uses markdown-it to convert the markdown to html and, then tiptap to edit the html and prosemirror to recreate markdown.
So this is normal behavior as markdown-it parses it as a list and tiptap also recreates a markdown list, the previous style is simply not saved and the common mark specs say both are equal (tiptap preferes *).

• '<' and '>' in URL are simply... removed.

But both characters are not even allowed within an URL.
So I would guess some of the used libraries simply validates the URL. See also rfc3986

• Langage indices (ex: 'python') in code fences are removed.

That's also sound's like a bug, as markdown-it and tiptap should support those (covered by commonmark specs)

[XueSheng-GIT]

I assume this is related to #593

[juliusknorr]

Since this ticket contains different separate topics, I'll close this and would ask you to open individual issues for each syntax problem together with a simple markdown example to reproduce.

Langage indices (ex: 'python') in code fences are removed.

I could reproduce this and opened #3328

'<' and '>' in URL are simply... removed.

I cannot reproduce this, so if you have an example file a separate issue would be highly appreciated.

Backslash are added on every single math anotations.
Break lines are removed.
Lists '-' are replaced with '*'.

Could you please open a separate issue with an example markdown file that shows specifically this issue?

[susnux]

Just for reference:

'<' and '>' in URL are simply... removed.

✔️ Should have been resolved with ProseMirror/prosemirror-markdown@48170d4

Backslash are added on every single math anotations.

✔️ Should have been resolved with #2704

Break lines are removed.

✔️ Was resolved by #2720

Lists '-' are replaced with '*'

❔ Still open, but hard to implement as both are semantically the same, this should not hurt.