The horizontal alignment of actions within the vertical "overflow" layout.
If the dialog's actions do not fit into a single row, then they are arranged in a column. This parameter controls the horizontal alignment of widgets in the case of an overflow.
If this parameter is null (the default) then OverflowBarAlignment.end is used.
- OverflowBar, which actions configures to lay itself out.
final OverflowBarAlignment? actionsOverflowAlignment;