Desktop platforms should not collapse selection on copy (#104209)

* Add tests

* fix tests

* updates
Co-authored-by: Renzo Olivares <roliv@google.com>

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

@@ -1693,12 +1693,12 @@ class EditableTextState extends State<EditableText> with AutomaticKeepAliveClien
 
       switch (defaultTargetPlatform) {
         case TargetPlatform.iOS:
-          break;
         case TargetPlatform.macOS:
-        case TargetPlatform.android:
-        case TargetPlatform.fuchsia:
         case TargetPlatform.linux:
         case TargetPlatform.windows:
+          break;
+        case TargetPlatform.android:
+        case TargetPlatform.fuchsia:
           // Collapse the selection and hide the toolbar and handles.
           userUpdateTextEditingValue(
             TextEditingValue(

packages/flutter/test/cupertino/text_field_test.dart

@@ -248,7 +248,7 @@ void main() {
     await tester.tap(find.text('Copy'));
     await tester.pumpAndSettle();
     expect(controller.text, 'blah1 blah2');
-    expect(controller.selection, const TextSelection(baseOffset: 5, extentOffset: 5));
+    expect(controller.selection, const TextSelection(baseOffset: 0, extentOffset: 5));
     expect(find.byType(CupertinoButton), findsNothing);
 
     // Paste it at the end.

packages/flutter/test/material/text_field_test.dart

@@ -250,7 +250,7 @@ void main() {
     await tester.tap(find.text('Copy'));
     await tester.pumpAndSettle();
     expect(controller.text, 'blah1 blah2');
-    expect(controller.selection, const TextSelection(baseOffset: 5, extentOffset: 5));
+    expect(controller.selection, const TextSelection(baseOffset: 0, extentOffset: 5));
     expect(find.byType(CupertinoButton), findsNothing);
 
     // Paste it at the end.
@@ -359,7 +359,7 @@ void main() {
     await tester.tap(find.text('Copy'));
     await tester.pumpAndSettle();
     expect(controller.text, 'blah1 blah2');
-    expect(controller.selection, const TextSelection(baseOffset: 5, extentOffset: 5));
+    expect(controller.selection, const TextSelection(baseOffset: 0, extentOffset: 5));
     expect(find.byType(CupertinoButton), findsNothing);
 
     // Paste it at the end.

packages/flutter/test/material/text_form_field_test.dart

@@ -65,7 +65,7 @@ void main() {
     await tester.tap(find.text('Copy'));
     await tester.pumpAndSettle();
     expect(controller.text, 'blah1 blah2');
-    expect(controller.selection, const TextSelection(baseOffset: 5, extentOffset: 5));
+    expect(controller.selection, const TextSelection(baseOffset: 0, extentOffset: 5));
     expect(find.byType(CupertinoButton), findsNothing);
 
     // Paste it at the end.
@@ -176,7 +176,7 @@ void main() {
     await tester.tap(find.text('Copy'));
     await tester.pumpAndSettle();
     expect(controller.text, 'blah1 blah2');
-    expect(controller.selection, const TextSelection(baseOffset: 5, extentOffset: 5));
+    expect(controller.selection, const TextSelection(baseOffset: 0, extentOffset: 5));
     expect(find.byType(CupertinoButton), findsNothing);
 
     // Paste it at the end.

packages/flutter/test/widgets/editable_text_test.dart

@@ -1553,6 +1553,82 @@ void main() {
     expect(find.text('Paste'), findsNothing);
   });
 
+  testWidgets('Copy selection does not collapse selection on desktop and iOS', (WidgetTester tester) async {
+    final TextEditingController localController = TextEditingController(text: 'Hello world');
+    await tester.pumpWidget(
+      MaterialApp(
+        home: EditableText(
+          backgroundCursorColor: Colors.grey,
+          controller: localController,
+          focusNode: focusNode,
+          style: textStyle,
+          cursorColor: cursorColor,
+          selectionControls: materialTextSelectionControls,
+        ),
+      ),
+    );
+
+    final EditableTextState state =
+    tester.state<EditableTextState>(find.byType(EditableText));
+
+    // Show the toolbar.
+    state.renderEditable.selectWordsInRange(
+      from: Offset.zero,
+      cause: SelectionChangedCause.tap,
+    );
+    await tester.pump();
+
+    final TextSelection copySelectionRange = localController.selection;
+
+    state.showToolbar();
+    await tester.pumpAndSettle();
+
+    expect(find.text('Copy'), findsOneWidget);
+
+    await tester.tap(find.text('Copy'));
+    await tester.pumpAndSettle();
+    expect(copySelectionRange, localController.selection);
+    expect(find.text('Copy'), findsNothing);
+  }, skip: kIsWeb, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.iOS, TargetPlatform.macOS, TargetPlatform.linux, TargetPlatform.windows })); // [intended]
+
+  testWidgets('Copy selection collapses selection and hides the toolbar on Android and Fuchsia', (WidgetTester tester) async {
+    final TextEditingController localController = TextEditingController(text: 'Hello world');
+    await tester.pumpWidget(
+      MaterialApp(
+        home: EditableText(
+          backgroundCursorColor: Colors.grey,
+          controller: localController,
+          focusNode: focusNode,
+          style: textStyle,
+          cursorColor: cursorColor,
+          selectionControls: materialTextSelectionControls,
+        ),
+      ),
+    );
+
+    final EditableTextState state =
+    tester.state<EditableTextState>(find.byType(EditableText));
+
+    // Show the toolbar.
+    state.renderEditable.selectWordsInRange(
+      from: Offset.zero,
+      cause: SelectionChangedCause.tap,
+    );
+    await tester.pump();
+
+    final TextSelection copySelectionRange = localController.selection;
+
+    state.showToolbar();
+    await tester.pumpAndSettle();
+
+    expect(find.text('Copy'), findsOneWidget);
+
+    await tester.tap(find.text('Copy'));
+    await tester.pumpAndSettle();
+    expect(localController.selection, TextSelection.collapsed(offset: copySelectionRange.extentOffset));
+    expect(find.text('Copy'), findsNothing);
+  }, skip: kIsWeb, variant: const TargetPlatformVariant(<TargetPlatform>{ TargetPlatform.android, TargetPlatform.fuchsia })); // [intended]
+
   testWidgets('can show the toolbar after clearing all text', (WidgetTester tester) async {
     // Regression test for https://github.com/flutter/flutter/issues/35998.
     await tester.pumpWidget(