Visual selection is not adjusted when changing text selection with TalkBack (#32832)

packages/flutter/lib/src/semantics/semantics.dart

@@ -3032,7 +3032,8 @@ class SemanticsConfiguration {
   set onSetSelection(SetSelectionHandler value) {
     assert(value != null);
     _addAction(SemanticsAction.setSelection, (dynamic args) {
-      final Map<String, int> selection = args;
+      assert(args != null && args is Map);
+      final Map<String, int> selection = args.cast<String, int>();
       assert(selection != null && selection['base'] != null && selection['extent'] != null);
       value(TextSelection(
         baseOffset: selection['base'],

packages/flutter/test/material/text_field_test.dart

@@ -3939,7 +3939,7 @@ void main() {
     ), ignoreTransform: true, ignoreRect: true));
 
     // move cursor back once
-    semanticsOwner.performAction(inputFieldId, SemanticsAction.setSelection, <String, int>{
+    semanticsOwner.performAction(inputFieldId, SemanticsAction.setSelection, <dynamic, dynamic>{
       'base': 4,
       'extent': 4,
     });
@@ -3947,7 +3947,7 @@ void main() {
     expect(controller.selection, const TextSelection.collapsed(offset: 4));
 
     // move cursor to front
-    semanticsOwner.performAction(inputFieldId, SemanticsAction.setSelection, <String, int>{
+    semanticsOwner.performAction(inputFieldId, SemanticsAction.setSelection, <dynamic, dynamic>{
       'base': 0,
       'extent': 0,
     });
@@ -3955,7 +3955,7 @@ void main() {
     expect(controller.selection, const TextSelection.collapsed(offset: 0));
 
     // select all
-    semanticsOwner.performAction(inputFieldId, SemanticsAction.setSelection, <String, int>{
+    semanticsOwner.performAction(inputFieldId, SemanticsAction.setSelection, <dynamic, dynamic>{
       'base': 0,
       'extent': 5,
     });

packages/flutter/test/widgets/semantics_test.dart

@@ -443,7 +443,7 @@ void main() {
           semanticsOwner.performAction(expectedId, action, true);
           break;
         case SemanticsAction.setSelection:
-          semanticsOwner.performAction(expectedId, action, <String, int>{
+          semanticsOwner.performAction(expectedId, action, <dynamic, dynamic>{
             'base': 4,
             'extent': 5,
           });