The chips of a view's messages: BuildForkChipMap over every fork but the one a fork view shows
(its chip would open the view already open). In a fork view, the fork's alternatives
(BuildForkAlternativeChips) come first on its first own message firstOwnDetailId.
The chips of a view's messages: BuildForkChipMap over every fork but the one a fork view shows (its chip would open the view already open). In a fork view, the fork's alternatives (BuildForkAlternativeChips) come first on its first own message
firstOwnDetailId.