Delete SemanticsUpdateBuilderNew and all references and usages (#49139)

This PR completest the migration by removing `SemanticsUpdateBuilderNew` from the engine.

This is mainly targeted at flutter/flutter#17988

Steps:
part 1: [engine] add `SemanticsUpdateBuilderNew` #47961
part 2: [flutter] use `SemanticsUpdateBuilderNew` flutter/flutter#138331
part 3: [engine] update `SemanticsUpdateBuilder` to be the same as `SemanticsUpdateBuilderNew` #48882
part 4: [flutter] use (now updated) `SemanticsUpdateBuilder` again flutter/flutter#139942
**part 5: [engine] remove `SemanticsBuilderNew`** <-- we are here

Author: bartekpacia

lib/ui/semantics.dart

@@ -1029,342 +1029,6 @@ base class _NativeSemanticsUpdateBuilder extends NativeFieldWrapperClass1 implem
   external void _build(_NativeSemanticsUpdate outSemanticsUpdate);
 }
 
-/// An object that creates [SemanticsUpdate] objects.
-///
-/// Once created, the [SemanticsUpdate] objects can be passed to
-/// [PlatformDispatcher.updateSemantics] to update the semantics conveyed to the
-/// user.
-@Deprecated('Temporary API. Will be removed once migration is complete.')
-abstract class SemanticsUpdateBuilderNew {
-  /// Creates an empty [SemanticsUpdateBuilderNew] object.
-  @Deprecated('Temporary API. Will be removed once migration is complete.')
-  factory SemanticsUpdateBuilderNew() = _NativeSemanticsUpdateBuilderNew;
-
-  /// Update the information associated with the node with the given `id`.
-  ///
-  /// The semantics nodes form a tree, with the root of the tree always having
-  /// an id of zero. The `childrenInTraversalOrder` and `childrenInHitTestOrder`
-  /// are the ids of the nodes that are immediate children of this node. The
-  /// former enumerates children in traversal order, and the latter enumerates
-  /// the same children in the hit test order. The two lists must have the same
-  /// length and contain the same ids. They may only differ in the order the
-  /// ids are listed in. For more information about different child orders, see
-  /// [DebugSemanticsDumpOrder].
-  ///
-  /// The system retains the nodes that are currently reachable from the root.
-  /// A given update need not contain information for nodes that do not change
-  /// in the update. If a node is not reachable from the root after an update,
-  /// the node will be discarded from the tree.
-  ///
-  /// The `flags` are a bit field of [SemanticsFlag]s that apply to this node.
-  ///
-  /// The `actions` are a bit field of [SemanticsAction]s that can be undertaken
-  /// by this node. If the user wishes to undertake one of these actions on this
-  /// node, the [PlatformDispatcher.onSemanticsActionEvent] will be called with
-  /// a [SemanticsActionEvent] specifying the action to be performed. Because
-  /// the semantics tree is maintained asynchronously, the
-  /// [PlatformDispatcher.onSemanticsActionEvent] callback might be called with
-  /// an action that is no longer possible.
-  ///
-  /// The `identifier` is a string that describes the node for UI automation
-  /// tools that work by querying the accessibility hierarchy, such as Android
-  /// UI Automator, iOS XCUITest, or Appium. It's not exposed to users.
-  ///
-  /// The `label` is a string that describes this node. The `value` property
-  /// describes the current value of the node as a string. The `increasedValue`
-  /// string will become the `value` string after a [SemanticsAction.increase]
-  /// action is performed. The `decreasedValue` string will become the `value`
-  /// string after a [SemanticsAction.decrease] action is performed. The `hint`
-  /// string describes what result an action performed on this node has. The
-  /// reading direction of all these strings is given by `textDirection`.
-  ///
-  /// The `labelAttributes`, `valueAttributes`, `hintAttributes`,
-  /// `increasedValueAttributes`, and `decreasedValueAttributes` are the lists of
-  /// [StringAttribute] carried by the `label`, `value`, `hint`, `increasedValue`,
-  /// and `decreasedValue` respectively. Their contents must not be changed during
-  /// the semantics update.
-  ///
-  /// The `tooltip` is a string that describe additional information when user
-  /// hover or long press on the backing widget of this semantics node.
-  ///
-  /// The fields `textSelectionBase` and `textSelectionExtent` describe the
-  /// currently selected text within `value`. A value of -1 indicates no
-  /// current text selection base or extent.
-  ///
-  /// The field `maxValueLength` is used to indicate that an editable text
-  /// field has a limit on the number of characters entered. If it is -1 there
-  /// is no limit on the number of characters entered. The field
-  /// `currentValueLength` indicates how much of that limit has already been
-  /// used up. When `maxValueLength` is >= 0, `currentValueLength` must also be
-  /// >= 0, otherwise it should be specified to be -1.
-  ///
-  /// The field `platformViewId` references the platform view, whose semantics
-  /// nodes will be added as children to this node. If a platform view is
-  /// specified, `childrenInHitTestOrder` and `childrenInTraversalOrder` must
-  /// be empty. A value of -1 indicates that this node is not associated with a
-  /// platform view.
-  ///
-  /// For scrollable nodes `scrollPosition` describes the current scroll
-  /// position in logical pixel. `scrollExtentMax` and `scrollExtentMin`
-  /// describe the maximum and minimum in-rage values that `scrollPosition` can
-  /// be. Both or either may be infinity to indicate unbound scrolling. The
-  /// value for `scrollPosition` can (temporarily) be outside this range, for
-  /// example during an overscroll. `scrollChildren` is the count of the
-  /// total number of child nodes that contribute semantics and `scrollIndex`
-  /// is the index of the first visible child node that contributes semantics.
-  ///
-  /// The `rect` is the region occupied by this node in its own coordinate
-  /// system.
-  ///
-  /// The `transform` is a matrix that maps this node's coordinate system into
-  /// its parent's coordinate system.
-  ///
-  /// The `elevation` describes the distance in z-direction between this node
-  /// and the `elevation` of the parent.
-  ///
-  /// The `thickness` describes how much space this node occupies in the
-  /// z-direction starting at `elevation`. Basically, in the z-direction the
-  /// node starts at `elevation` above the parent and ends at `elevation` +
-  /// `thickness` above the parent.
-  void updateNode({
-    required int id,
-    required int flags,
-    required int actions,
-    required int maxValueLength,
-    required int currentValueLength,
-    required int textSelectionBase,
-    required int textSelectionExtent,
-    required int platformViewId,
-    required int scrollChildren,
-    required int scrollIndex,
-    required double scrollPosition,
-    required double scrollExtentMax,
-    required double scrollExtentMin,
-    required double elevation,
-    required double thickness,
-    required Rect rect,
-    required String identifier,
-    required String label,
-    required List<StringAttribute> labelAttributes,
-    required String value,
-    required List<StringAttribute> valueAttributes,
-    required String increasedValue,
-    required List<StringAttribute> increasedValueAttributes,
-    required String decreasedValue,
-    required List<StringAttribute> decreasedValueAttributes,
-    required String hint,
-    required List<StringAttribute> hintAttributes,
-    String? tooltip,
-    TextDirection? textDirection,
-    required Float64List transform,
-    required Int32List childrenInTraversalOrder,
-    required Int32List childrenInHitTestOrder,
-    required Int32List additionalActions,
-  });
-
-  /// Update the custom semantics action associated with the given `id`.
-  ///
-  /// The name of the action exposed to the user is the `label`. For overridden
-  /// standard actions this value is ignored.
-  ///
-  /// The `hint` should describe what happens when an action occurs, not the
-  /// manner in which a tap is accomplished. For example, use "delete" instead
-  /// of "double tap to delete".
-  ///
-  /// The text direction of the `hint` and `label` is the same as the global
-  /// window.
-  ///
-  /// For overridden standard actions, `overrideId` corresponds with a
-  /// [SemanticsAction.index] value. For custom actions this argument should not be
-  /// provided.
-  void updateCustomAction({required int id, String? label, String? hint, int overrideId = -1});
-
-  /// Creates a [SemanticsUpdate] object that encapsulates the updates recorded
-  /// by this object.
-  ///
-  /// The returned object can be passed to [PlatformDispatcher.updateSemantics]
-  /// to actually update the semantics retained by the system.
-  ///
-  /// This object is unusable after calling build.
-  SemanticsUpdate build();
-}
-
-base class _NativeSemanticsUpdateBuilderNew extends NativeFieldWrapperClass1 implements SemanticsUpdateBuilderNew {
-  _NativeSemanticsUpdateBuilderNew() { _constructor(); }
-
-  @Native<Void Function(Handle)>(symbol: 'SemanticsUpdateBuilder::Create')
-  external void _constructor();
-
-  @override
-  void updateNode({
-    required int id,
-    required int flags,
-    required int actions,
-    required int maxValueLength,
-    required int currentValueLength,
-    required int textSelectionBase,
-    required int textSelectionExtent,
-    required int platformViewId,
-    required int scrollChildren,
-    required int scrollIndex,
-    required double scrollPosition,
-    required double scrollExtentMax,
-    required double scrollExtentMin,
-    required double elevation,
-    required double thickness,
-    required Rect rect,
-    required String identifier,
-    required String label,
-    required List<StringAttribute> labelAttributes,
-    required String value,
-    required List<StringAttribute> valueAttributes,
-    required String increasedValue,
-    required List<StringAttribute> increasedValueAttributes,
-    required String decreasedValue,
-    required List<StringAttribute> decreasedValueAttributes,
-    required String hint,
-    required List<StringAttribute> hintAttributes,
-    String? tooltip,
-    TextDirection? textDirection,
-    required Float64List transform,
-    required Int32List childrenInTraversalOrder,
-    required Int32List childrenInHitTestOrder,
-    required Int32List additionalActions,
-  }) {
-    assert(_matrix4IsValid(transform));
-    _updateNode(
-      id,
-      flags,
-      actions,
-      maxValueLength,
-      currentValueLength,
-      textSelectionBase,
-      textSelectionExtent,
-      platformViewId,
-      scrollChildren,
-      scrollIndex,
-      scrollPosition,
-      scrollExtentMax,
-      scrollExtentMin,
-      rect.left,
-      rect.top,
-      rect.right,
-      rect.bottom,
-      elevation,
-      thickness,
-      identifier,
-      label,
-      labelAttributes,
-      value,
-      valueAttributes,
-      increasedValue,
-      increasedValueAttributes,
-      decreasedValue,
-      decreasedValueAttributes,
-      hint,
-      hintAttributes,
-      tooltip ?? '',
-      textDirection != null ? textDirection.index + 1 : 0,
-      transform,
-      childrenInTraversalOrder,
-      childrenInHitTestOrder,
-      additionalActions,
-    );
-  }
-  @Native<
-      Void Function(
-          Pointer<Void>,
-          Int32,
-          Int32,
-          Int32,
-          Int32,
-          Int32,
-          Int32,
-          Int32,
-          Int32,
-          Int32,
-          Int32,
-          Double,
-          Double,
-          Double,
-          Double,
-          Double,
-          Double,
-          Double,
-          Double,
-          Double,
-          Handle,
-          Handle,
-          Handle,
-          Handle,
-          Handle,
-          Handle,
-          Handle,
-          Handle,
-          Handle,
-          Handle,
-          Handle,
-          Handle,
-          Int32,
-          Handle,
-          Handle,
-          Handle,
-          Handle)>(symbol: 'SemanticsUpdateBuilder::updateNode')
-  external void _updateNode(
-      int id,
-      int flags,
-      int actions,
-      int maxValueLength,
-      int currentValueLength,
-      int textSelectionBase,
-      int textSelectionExtent,
-      int platformViewId,
-      int scrollChildren,
-      int scrollIndex,
-      double scrollPosition,
-      double scrollExtentMax,
-      double scrollExtentMin,
-      double left,
-      double top,
-      double right,
-      double bottom,
-      double elevation,
-      double thickness,
-      String identifier,
-      String label,
-      List<StringAttribute> labelAttributes,
-      String value,
-      List<StringAttribute> valueAttributes,
-      String increasedValue,
-      List<StringAttribute> increasedValueAttributes,
-      String decreasedValue,
-      List<StringAttribute> decreasedValueAttributes,
-      String hint,
-      List<StringAttribute> hintAttributes,
-      String tooltip,
-      int textDirection,
-      Float64List transform,
-      Int32List childrenInTraversalOrder,
-      Int32List childrenInHitTestOrder,
-      Int32List additionalActions);
-
-  @override
-  void updateCustomAction({required int id, String? label, String? hint, int overrideId = -1}) {
-    _updateCustomAction(id, label ?? '', hint ?? '', overrideId);
-  }
-  @Native<Void Function(Pointer<Void>, Int32, Handle, Handle, Int32)>(symbol: 'SemanticsUpdateBuilder::updateCustomAction')
-  external void _updateCustomAction(int id, String label, String hint, int overrideId);
-
-  @override
-  SemanticsUpdate build() {
-    final _NativeSemanticsUpdate semanticsUpdate = _NativeSemanticsUpdate._();
-    _build(semanticsUpdate);
-    return semanticsUpdate;
-  }
-  @Native<Void Function(Pointer<Void>, Handle)>(symbol: 'SemanticsUpdateBuilder::build')
-  external void _build(_NativeSemanticsUpdate outSemanticsUpdate);
-}
-
 /// An opaque object representing a batch of semantics updates.
 ///
 /// To create a SemanticsUpdate object, use a [SemanticsUpdateBuilder].