Indenting list elements of different type not possible

[provokateurin]

Describe the bug
It is not possible to indent bullet point items if they have a different type than the previous bullet point items.

To Reproduce
Steps to reproduce the behavior:

1. Create a normal bullet point list
2. Add a checkbox item at the end
3. Place the cursor in the checkbox item and press tab

Expected behavior
The checkbox item should be indented, but it isn't because it has a different type than the previous bullet points.

Server details:

• Nextcloud version: 27.0.2
• PHP Version: 8.2
• Database: Postgres

Client details:

• OS: Arch Linux
• Browser: Firefox
• Browser version: 117
• Device: Desktop

[mejo-]

This is because the two list items of different types are regarded as separate lists. We don't support lists with mixed types on the same indention level.

What might be possible is to check whether the preceding block node ends with another list and then attach the current list as indented items to the last item of preceding list.