[material_ui] Remove unused parameters from constructors of generic classes.

packages/material_ui/lib/src/autocomplete.dart

@@ -226,7 +226,6 @@ class _AutocompleteField extends StatelessWidget {
 // The default Material-style Autocomplete options.
 class _AutocompleteOptions<T extends Object> extends StatelessWidget {
   const _AutocompleteOptions({
-    super.key,
     required this.displayStringForOption,
     required this.onSelected,
     required this.openDirection,

packages/material_ui/lib/src/bottom_sheet.dart

@@ -648,7 +648,6 @@ class _RenderBottomSheetLayoutWithSizeListener extends RenderShiftedBox {
 
 class _ModalBottomSheet<T> extends StatefulWidget {
   const _ModalBottomSheet({
-    super.key,
     required this.route,
     this.backgroundColor,
     this.elevation,

packages/material_ui/lib/src/dropdown.dart

@@ -110,7 +110,6 @@ class _DropdownMenuPainter extends CustomPainter {
 // The widget that is the button wrapping the menu items.
 class _DropdownMenuItemButton<T> extends StatefulWidget {
   const _DropdownMenuItemButton({
-    super.key,
     this.padding,
     required this.route,
     required this.buttonRect,
@@ -249,7 +248,6 @@ class _DropdownMenuItemButtonState<T> extends State<_DropdownMenuItemButton<T>>
 
 class _DropdownMenu<T> extends StatefulWidget {
   const _DropdownMenu({
-    super.key,
     this.padding,
     required this.route,
     required this.buttonRect,
@@ -258,7 +256,6 @@ class _DropdownMenu<T> extends StatefulWidget {
     required this.enableFeedback,
     this.borderRadius,
     required this.scrollController,
-    this.menuWidth,
     this.mouseCursor,
   });
 
@@ -270,7 +267,6 @@ class _DropdownMenu<T> extends StatefulWidget {
   final bool enableFeedback;
   final BorderRadius? borderRadius;
   final ScrollController scrollController;
-  final double? menuWidth;
   final MouseCursor? mouseCursor;
 
   @override
@@ -649,7 +645,6 @@ class _DropdownRoute<T> extends PopupRoute<_DropdownRouteResult<T>> {
 
 class _DropdownRoutePage<T> extends StatefulWidget {
   const _DropdownRoutePage({
-    super.key,
     required this.route,
     required this.constraints,
     this.items,
@@ -758,7 +753,7 @@ class _DropdownRoutePageState<T> extends State<_DropdownRoutePage<T>> {
 // selected item lines up with the vertical center of the dropdown button,
 // as closely as possible.
 class _MenuItem<T> extends SingleChildRenderObjectWidget {
-  const _MenuItem({super.key, required this.onLayout, required this.item}) : super(child: item);
+  const _MenuItem({required this.onLayout, required this.item}) : super(child: item);
 
   final ValueChanged<Size> onLayout;
   final DropdownMenuItem<T>? item;
@@ -1054,7 +1049,6 @@ class DropdownButton<T> extends StatefulWidget {
        _isEmpty = false;
 
   DropdownButton._formField({
-    super.key,
     required this.items,
     this.selectedItemBuilder,
     this.value,
@@ -1064,15 +1058,13 @@ class DropdownButton<T> extends StatefulWidget {
     this.onTap,
     this.elevation = 8,
     this.style,
-    this.underline,
     this.icon,
     this.iconDisabledColor,
     this.iconEnabledColor,
     this.iconSize = 24.0,
     this.isDense = false,
     this.isExpanded = false,
     this.itemHeight = kMinInteractiveDimension,
-    this.menuWidth,
     this.focusColor,
     this.focusNode,
     this.autofocus = false,
@@ -1087,7 +1079,9 @@ class DropdownButton<T> extends StatefulWidget {
     this.dropdownMenuItemMouseCursor,
     required this._inputDecoration,
     required this._isEmpty,
-  }) : assert(
+  }) : underline = null,
+       menuWidth = null,
+       assert(
          items == null ||
              items.isEmpty ||
              value == null ||

packages/material_ui/lib/src/popup_menu.dart

@@ -674,7 +674,6 @@ class _CheckedPopupMenuItemState<T> extends PopupMenuItemState<T, CheckedPopupMe
 
 class _PopupMenu<T> extends StatefulWidget {
   const _PopupMenu({
-    super.key,
     required this.itemKeys,
     required this.route,
     required this.semanticLabel,

packages/material_ui/lib/src/segmented_button.dart

@@ -735,7 +735,6 @@ class SegmentedButtonState<T> extends State<SegmentedButton<T>> {
 
 class _SegmentedButtonRenderWidget<T> extends MultiChildRenderObjectWidget {
   const _SegmentedButtonRenderWidget({
-    super.key,
     required this.segments,
     required this.enabledBorder,
     required this.disabledBorder,

packages/material_ui/test/scaffold_test.dart

@@ -3877,12 +3877,7 @@ class _GeometryCachePainter extends CustomPainter {
 }
 
 class _CustomPageRoute<T> extends PageRoute<T> {
-  _CustomPageRoute({
-    required this.builder,
-    RouteSettings super.settings = const RouteSettings(),
-    this.maintainState = true,
-    super.fullscreenDialog,
-  });
+  _CustomPageRoute({required this.builder, this.maintainState = true, super.fullscreenDialog});
 
   final WidgetBuilder builder;