createRow

Constructs a Row for the row at rowIndex in the data array, then runs every registered feature's createRow hook so features can attach their own members.

• id is the row id resolved by _getRowId.

• original is the source data record.

• depth is the nesting depth (0 for top-level rows).

• subRows is the already-constructed child rows when known; otherwise pass null to start with an empty list.

• parentId is the parent row's id when this row is a sub-row.