Remove mouse tap text drag selection throttling to improve responsiveness (#123460)

Remove mouse tap text drag selection throttling to improve responsiveness

packages/flutter/lib/src/widgets/tap_and_drag_gestures.dart

@@ -794,10 +794,6 @@ sealed class BaseTapAndDragGestureRecognizer extends OneSequenceGestureRecognize
   /// The frequency at which the [onDragUpdate] callback is called.
   ///
   /// The value defaults to null, meaning there is no delay for [onDragUpdate] callback.
-  ///
-  /// See also:
-  ///   * [TextSelectionGestureDetector], which uses this parameter to avoid excessive updates
-  ///     text layouts in text fields.
   Duration? dragUpdateThrottleFrequency;
 
   /// An upper bound for the amount of taps that can belong to one tap series.

packages/flutter/lib/src/widgets/text_selection.dart

@@ -32,10 +32,6 @@ import 'transitions.dart';
 export 'package:flutter/rendering.dart' show TextSelectionPoint;
 export 'package:flutter/services.dart' show TextSelectionDelegate;
 
-/// A duration that controls how often the drag selection update callback is
-/// called.
-const Duration _kDragSelectionUpdateThrottle = Duration(milliseconds: 50);
-
 /// The type for a Function that builds a toolbar's container with the given
 /// child.
 ///
@@ -2953,10 +2949,6 @@ class TextSelectionGestureDetector extends StatefulWidget {
   final GestureTapDragStartCallback? onDragSelectionStart;
 
   /// Called repeatedly as a mouse moves while dragging.
-  ///
-  /// The frequency of calls is throttled to avoid excessive text layout
-  /// operations in text fields. The throttling is controlled by the constant
-  /// [_kDragSelectionUpdateThrottle].
   final GestureTapDragUpdateCallback? onDragSelectionUpdate;
 
   /// Called when a mouse that was previously dragging is released.
@@ -3123,7 +3115,6 @@ class _TextSelectionGestureDetectorState extends State<TextSelectionGestureDetec
                 // Text selection should start from the position of the first pointer
                 // down event.
                 ..dragStartBehavior = DragStartBehavior.down
-                ..dragUpdateThrottleFrequency = _kDragSelectionUpdateThrottle
                 ..onTapDown = _handleTapDown
                 ..onDragStart = _handleDragStart
                 ..onDragUpdate = _handleDragUpdate
@@ -3142,7 +3133,6 @@ class _TextSelectionGestureDetectorState extends State<TextSelectionGestureDetec
                 // Text selection should start from the position of the first pointer
                 // down event.
                 ..dragStartBehavior = DragStartBehavior.down
-                ..dragUpdateThrottleFrequency = _kDragSelectionUpdateThrottle
                 ..onTapDown = _handleTapDown
                 ..onDragStart = _handleDragStart
                 ..onDragUpdate = _handleDragUpdate