weight
Appends weighted parent-data behavior to this modifier chain.
The parent row consumes the innermost weight provider on the direct child chain.
Return
this chain with weighted parent-data behavior appended.
Parameters
weight
the positive finite allocation weight.
fill
whether the child receives the complete allocated main-axis slot.
Throws
when weight is non-positive or non-finite.
when this scope has escaped its callback or constructing thread.