chore: init from code-review-graph-main snapshot (v2.3.7)

tests/fixtures/cpp_qt_headers/MyWidget.h

@@ -0,0 +1,26 @@
+#pragma once
+#include <QMainWindow>
+
+QT_BEGIN_NAMESPACE namespace Ui { class MyWidgetClass; };
+QT_END_NAMESPACE
+
+class MyWidget : public QMainWindow {
+  Q_OBJECT
+
+ public:
+  MyWidget(QWidget* parent = nullptr);
+  ~MyWidget();
+  void doSomething();
+  int calculateValue(int a, int b);
+
+ protected Q_SLOTS:
+  void onButtonClicked();
+  void onDataReceived(int value);
+
+ public Q_SLOTS:
+  void onReset();
+
+ Q_SIGNALS:
+  void dataReady(int result);
+  void errorOccurred(const QString& msg);
+};