getDialogContentMaxWidth function
Calculates a content width that can fill AlertDialog with the screen width.
Implementation
double getDialogContentMaxWidth(BuildContext context) {
var horizontalPadding = MediaQuery.of(context).padding + kDialogDefaultInsetPadding + kAlertDialogDefaultContentPadding;
return MediaQuery.of(context).size.width - horizontalPadding.horizontal;
}