This is indeed a regression. Since “normal” paragraph styles allow to layout text in the margins after adjusting left and right indents, then any feature should allow such spill over inside margins.
I attempted a workaround. Recently @mikekaganski explained in a post (which I can’t find back while writing this comment) that indent and first line indent could be taken from paragraph style if list style did not provide them.
Consequently I configured list style level 1 (did not change the others levels; perhaps this makes a difference) alignment and indent to 0 while transferring the parameters into the paragraph style for -1 cm (first line indent) and 0 (before text).
Unfortunately, it does not work. List style still overrides paragraph style. So if @mikekaganski could explain the rationale behind his statement (or the developer’s point of view), thanks a lot.
Though I understand the need to highlight and emphasise list numbers by sending them in the margin where they are visible and immediately usable as labels, I feel there is a contradiction between the definition of Writer margins as a no-print area (or rather reserved for special data like line numbers) and their use for document contents data. From a strict theoretical abstract point of view, shouldn’t this issue be fixed by a rigorous design of page styles and paragraph styles where left indent is enabled to leave room for the list number?
Anyway, since negative indents are allowed in paragraph styles and list styles take ownership of the left indent, the same possibilities should be offered in list styles as in paragraph styles.
