Hello togehter,
is it usual to have auto-fill-mode (automatic new-line after n
characters) turned on in org or org-roam (including fill-column set e.g.
to 80)?
I cannot comment on that. Enabling auto-fill-mode is user preference.
Or let me ask from another point of view: Is it usual to have multiline
list entries?
Yes, if auto-fill-mode is enabled in org-mode.
I know that org is not markdown but I tried some markdown editors to
test it. They still recognize the linebreak in my first example and
rendered it "correct" as a 3 item list.
I checked the syntax docu [1] about it but I couldn't find a hint or didn't understand.
Do I understand it correct that the end of a list is marked by an empty
line?
Yes. I think that the list items follow the same rules as Paragraphs [1] i.e. A list item continues until it sees a blank line. This is identical to Markdown.
Below, you have 2 list items:
- item 1
- item 2
Below is also 2 list items:
- item 1
item 1 continued
- item 2
Below is also 2 list items, but the first item has 2 paragraphs:
- item 1
second paragraph in item 1
- item 2
I hope that helps.