Set viewId on the text input configuration (fixes dead keyboard input on Windows)

lib/src/ui/custom_text_edit.dart

@@ -160,6 +160,7 @@ class CustomTextEditState extends State<CustomTextEdit> with TextInputClient {
       _connection!.show();
     } else {
       final config = TextInputConfiguration(
+        viewId: View.of(context).viewId,
         inputType: widget.inputType,
         inputAction: widget.inputAction,
         keyboardAppearance: widget.keyboardAppearance,

test/src/terminal_view_test.dart

@@ -420,6 +420,43 @@ void main() {
     });
   });
 
+  group('TerminalView text input configuration', () {
+    testWidgets('carries the view id of the view it belongs to',
+        (tester) async {
+      // Flutter's Windows embedder rejects TextInput.setClient outright when
+      // the configuration carries no viewId ("Could not set client, view ID is
+      // null"), leaving the connection unattached. Printable characters are
+      // then dropped entirely, since CustomTextEdit has no hardware key
+      // fallback for them the way CustomKeyboardListener does. macOS tolerates
+      // the omission via its implicit view, so it only surfaces on Windows.
+      final expected = tester.view.viewId;
+
+      int? actual;
+      tester.binding.defaultBinaryMessenger.setMockMethodCallHandler(
+        SystemChannels.textInput,
+        (call) async {
+          if (call.method == 'TextInput.setClient') {
+            actual = ((call.arguments as List).last as Map)['viewId'] as int?;
+          }
+          return null;
+        },
+      );
+      addTearDown(() {
+        tester.binding.defaultBinaryMessenger
+            .setMockMethodCallHandler(SystemChannels.textInput, null);
+      });
+
+      await tester.pumpWidget(MaterialApp(
+        home: TerminalView(Terminal(), autofocus: true),
+      ));
+
+      await tester.tap(find.byType(TerminalView));
+      await tester.pump(Duration(seconds: 1));
+
+      expect(actual, expected);
+    });
+  });
+
   group('TerminalView.simulateScroll', () {
     testWidgets('works', (tester) async {
       final terminalOutput = <String>[];