Previously, only comments could have IDs, because we only needed IDs
for replying. But we might also use them for notifications soon.
Bug: T264478
Change-Id: I1bcad02bf17ab54bc5028a959543c10f0430836b
The tests pass either way because this trivial difference is ignored,
but it's annoying when trying to update changed tests.
Change-Id: I7ad1acad43e30a63843cfda4d0d08ff663ef3252
Previously we preferred that, but used '*' (<ul><li>) when the parent
comment or the previous reply also used it.
Bug: T252708
Change-Id: I3abf606da6693905764f1be745fad999fdf57fbe
