align
Appends a vertical placement override within the child's measured row.
The parent flow row consumes the innermost alignment provider on the direct child chain. This override affects placement only and does not stretch the child or align the complete group of rows.
Return
this chain with flow-row alignment behavior appended.
Parameters
alignment
placement of the direct child within the height of its row.
Throws
when this scope has escaped its callback or constructing thread.