Happened to me recently - I was merging from a merging lane from the right (car A), and at the same time another car was changing lanes (car B) (see picture).
Who has to give way? My take it's car B because car A is on the right side of it and they both changing marked lanes
P.s. after the discussion I realised there can be another option where both cars should give way. Unfortunately can not add an option to the poll.