Reads a channel's placement from its registry row. The row is edited by hand, so anything that is not a placement is
ignored: no Placement means the tab, no usable AllowedPlacements means anywhere, and a Placement the list does not
allow gives way to the first placement it lists.
Reads a channel's placement from its registry row. The row is edited by hand, so anything that is not a placement is ignored: no
Placementmeans the tab, no usableAllowedPlacementsmeans anywhere, and aPlacementthe list does not allow gives way to the first placement it lists.