inject_constructors_for_shorthand_shorter.dart

static extension EdgeInsetsGeometryExtensions on EdgeInsetsGeometry {
  // Forward to EdgeInsets:
  const factory EdgeInsetsGeometry.fromLTRB = EdgeInsets.fromLTRB;
  const factory EdgeInsetsGeometry.all = EdgeInsets.all;
  const factory EdgeInsetsGeometry.only = EdgeInsets.only;
  const factory EdgeInsetsGeometry.symmetric = EdgeInsets.symmetric;

  static const zero = EdgeInsets.only();

  // Forward to EdgeInsetsDirectional:
  const factory EdgeInsetsGeometry.fromSTEB = EdgeInsetsDirectional.fromSTEB;
  const factory EdgeInsetsGeometry.onlyDirectional = EdgeInsetsDirectional.only;
  const factory EdgeInsetsGeometry.symmetricDirectional = EdgeInsetsDirectional.symmetric;
  const factory EdgeInsetsGeometry.allDirectional = EdgeInsetsDirectional.all;

  static const zeroDirectional = EdgeInsetsDirectional.only();
}

We could also allow this:

static extension EdgeInsetsGeometryExtensions on EdgeInsetsGeometry {
  // Forward to EdgeInsets:
  const factory .fromLTRB = EdgeInsets.fromLTRB;
  const factory .all = EdgeInsets.all;
  const factory .only = EdgeInsets.only;
  const factory .symmetric = EdgeInsets.symmetric;

  static const zero = EdgeInsets.only();

  // Forward to EdgeInsetsDirectional:
  const factory .fromSTEB = EdgeInsetsDirectional.fromSTEB;
  const factory .onlyDirectional = EdgeInsetsDirectional.only;
  const factory .symmetricDirectional = EdgeInsetsDirectional.symmetric;
  const factory .allDirectional = EdgeInsetsDirectional.all;

  static const zeroDirectional = EdgeInsetsDirectional.only();
}