Fixed find common parent for when there is to be a feedback connection within a module

lib/src/module_extensions.dart

@@ -1,4 +1,4 @@
-// Copyright (C) 2024-2025 Intel Corporation
+// Copyright (C) 2024-2026 Intel Corporation
 // SPDX-License-Identifier: BSD-3-Clause
 //
 // module_extensions.dart
@@ -129,8 +129,9 @@ extension RohdBridgeModuleExtensions on Module {
   }
 }
 
-/// Returns the common parent of two modules [firstChild] and [secondChild]
-/// Assuming at least one common parent exists
+/// Returns the common parent of two modules [firstChild] and [secondChild].
+/// If the two modules are the same, returns that module.
+/// If no common parent is found and they are not the same module, returns null.
 Module? findCommonParent(Module firstChild, Module secondChild) {
   final firstPath = List<Module>.from(firstChild.hierarchy(), growable: false);
   final secondPath =
@@ -145,6 +146,11 @@ Module? findCommonParent(Module firstChild, Module secondChild) {
     return null;
   }
 
+  if (firstChild == secondChild) {
+    // if the two modules are the same, return that module as the common parent
+    return firstChild;
+  }
+
   if (secondPath.contains(firstChild) && !firstPath.contains(secondChild)) {
     // firstChild is in the parent hierarchy of second
     return firstChild;

lib/src/references/port_reference.dart

@@ -1,4 +1,4 @@
-// Copyright (C) 2024-2025 Intel Corporation
+// Copyright (C) 2024-2026 Intel Corporation
 // SPDX-License-Identifier: BSD-3-Clause
 //
 // port_reference.dart

test/collapse_array_test.dart

@@ -1,4 +1,4 @@
-// Copyright (C) 2024-2025 Intel Corporation
+// Copyright (C) 2024-2026 Intel Corporation
 // SPDX-License-Identifier: BSD-3-Clause
 //
 // collapse_array_test.dart

test/feedthrough_test.dart

@@ -1,4 +1,4 @@
-// Copyright (C) 2024-2025 Intel Corporation
+// Copyright (C) 2024-2026 Intel Corporation
 // SPDX-License-Identifier: BSD-3-Clause
 //
 // feedthrough_test.dart
@@ -44,4 +44,14 @@ void main() {
 
     expect(testPass1 && testPass2, true);
   });
+
+  test('Feedback connection', () {
+    final top = BridgeModule('Top')
+      ..createPort('x', PortDirection.input)
+      ..createPort('y', PortDirection.output);
+
+    connectPorts(top.port('x'), top.port('y'));
+    top.input('x').put(1);
+    expect(top.output('y').value.toInt(), 1);
+  });
 }