Markdown: First Line Of "Triple Backtick" Code Blocks is Sometimes "Absorbed" Into Triple-Backtick-Line

[gohrner]

Please use the 👍 reaction to show that you are affected by the same issue. Please don't comment if you have no relevant information to add!

Describe the bug
First Line Of "Triple Backtick" Code Blocks is Sometimes "Absorbed" Into Triple-Backtick-Line.

See screencast.

To Reproduce
Steps to reproduce the behavior:

1. Enter a (in this example one-line) Markdown code block into a description field
2. Leave edit mode.
3. The description field will be empty.
4. Re-entering edit mode will show why: the code block content was merged into the first "backtick line".

Expected behavior
The first line in the actual code block should NOT be merged into the backtick line.

Screenshots

Nextcloud (please complete the following information):

• Nextcloud-Version: 25.0.4
• Forms-Version: 3.2.0

Desktop (please complete the following information):

• OS: KDE neon (Ubuntu 22.04)
• Browser: Chromium
• Version 111.0.5563.64 (Offizieller Build) Built on Ubuntu , running on neon 22.04 (64-Bit)

[susnux]

I can only reproduce this with Chrome. Using Firefox everything works as expected.

I think this is another issue with NcRichContenteditable.

[susnux]

BTW this an instance of nextcloud-libraries/nextcloud-vue#3836