actions property Null safety
The (optional) set of actions that are displayed at the bottom of the dialog with an OverflowBar.
Typically this is a list of TextButton widgets. It is recommended to set the Text.textAlign to TextAlign.end for the Text within the TextButton, so that buttons whose labels wrap to an extra line align with the overall OverflowBar's alignment within the dialog.
final List<Widget>? actions;