Refactor TextSelectionOverlay (#98153)

* Refactor TextSelectionOverlay

* fix test

* remove print

* fix more tests

* update

* added tests

* fix comments

* fmt

* fix test

* addressing comment

* remove dispose

* remove new line

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

@@ -1089,7 +1089,7 @@ class EditableText extends StatefulWidget {
   /// {@endtemplate}
   final SelectionChangedCallback? onSelectionChanged;
 
-  /// {@macro flutter.widgets.TextSelectionOverlay.onSelectionHandleTapped}
+  /// {@macro flutter.widgets.SelectionOverlay.onSelectionHandleTapped}
   final VoidCallback? onSelectionHandleTapped;
 
   /// {@template flutter.widgets.editableText.inputFormatters}

packages/flutter/test/material/text_field_test.dart

@@ -1326,7 +1326,7 @@ void main() {
 
     // Move the gesture very slightly
     await gesture.moveBy(const Offset(1.0, 1.0));
-    await tester.pump(TextSelectionOverlay.fadeDuration * 0.5);
+    await tester.pump(SelectionOverlay.fadeDuration * 0.5);
     handle = tester.widget(fadeFinder.at(0));
 
     // The handle should still be fully opaque.

packages/flutter/test/widgets/editable_text_test.dart

@@ -4759,14 +4759,14 @@ void main() {
       if (expectedRightVisibleBefore)
         expect(right.opacity.value, equals(1.0));
 
-      await tester.pump(TextSelectionOverlay.fadeDuration ~/ 2);
+      await tester.pump(SelectionOverlay.fadeDuration ~/ 2);
 
       if (expectedLeftVisible != expectedLeftVisibleBefore)
         expect(left.opacity.value, equals(0.5));
       if (expectedRightVisible != expectedRightVisibleBefore)
         expect(right.opacity.value, equals(0.5));
 
-      await tester.pump(TextSelectionOverlay.fadeDuration ~/ 2);
+      await tester.pump(SelectionOverlay.fadeDuration ~/ 2);
 
       if (expectedLeftVisible)
         expect(left.opacity.value, equals(1.0));
@@ -7462,14 +7462,14 @@ void main() {
       if (expectedRightVisibleBefore)
         expect(right.opacity.value, equals(1.0));
 
-      await tester.pump(TextSelectionOverlay.fadeDuration ~/ 2);
+      await tester.pump(SelectionOverlay.fadeDuration ~/ 2);
 
       if (expectedLeftVisible != expectedLeftVisibleBefore)
         expect(left.opacity.value, equals(0.5));
       if (expectedRightVisible != expectedRightVisibleBefore)
         expect(right.opacity.value, equals(0.5));
 
-      await tester.pump(TextSelectionOverlay.fadeDuration ~/ 2);
+      await tester.pump(SelectionOverlay.fadeDuration ~/ 2);
 
       if (expectedLeftVisible)
         expect(left.opacity.value, equals(1.0));

packages/flutter/test/widgets/selectable_text_test.dart

@@ -568,7 +568,7 @@ void main() {
 
     // Move the gesture very slightly
     await gesture.moveBy(const Offset(1.0, 1.0));
-    await tester.pump(TextSelectionOverlay.fadeDuration * 0.5);
+    await tester.pump(SelectionOverlay.fadeDuration * 0.5);
     handle = tester.widget(fadeFinder.at(0));
 
     // The handle should still be fully opaque.