Fix TextField performing both new line and input action (flutter#36893)

Co-authored-by: Bruno Leroux <[email protected]>

Author: bleroux

lib/web_ui/lib/src/engine/text_editing/text_editing.dart

@@ -1376,6 +1376,10 @@ abstract class DefaultTextEditingStrategy with CompositionAwareMixin implements
       final DomKeyboardEvent event = e as DomKeyboardEvent;
       if (event.keyCode == _kReturnKeyCode) {
         onAction!(inputConfiguration.inputAction);
+        // Prevent the browser from inserting a new line when it's not a multiline input.
+        if (inputConfiguration.inputType is! MultilineInputType) {
+          event.preventDefault();
+        }
       }
     }
   }

lib/web_ui/test/text_editing_test.dart

@@ -390,6 +390,28 @@ Future<void> testMain() async {
       expect(event.defaultPrevented, isFalse);
     });
 
+    test('Triggers input action and prevent new line key event for single line field', () {
+      // Regression test for https://github.com/flutter/flutter/issues/113559
+      final InputConfiguration config = InputConfiguration();
+      editingStrategy!.enable(
+        config,
+        onChange: trackEditingState,
+        onAction: trackInputAction,
+      );
+
+      // No input action so far.
+      expect(lastInputAction, isNull);
+
+      final DomKeyboardEvent event = dispatchKeyboardEvent(
+        editingStrategy!.domElement!,
+        'keydown',
+        keyCode: _kReturnKeyCode,
+      );
+      expect(lastInputAction, 'TextInputAction.done');
+      // And default behavior of keyboard event should have been prevented.
+      expect(event.defaultPrevented, isTrue);
+    });
+
     test('globally positions and sizes its DOM element', () {
       editingStrategy!.enable(
         singlelineConfig,