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

tests/fixtures/cpp_qt_headers/MyWidget.cpp

@@ -0,0 +1,12 @@
+#include "MyWidget.h"
+
+MyWidget::MyWidget(QWidget* parent) : QMainWindow(parent) {}
+MyWidget::~MyWidget() {}
+void MyWidget::doSomething() { onReset(); }
+int MyWidget::calculateValue(int a, int b) { return a + b; }
+void MyWidget::onButtonClicked() { Q_EMIT dataReady(calculateValue(1, 2)); }
+void MyWidget::onDataReceived(int value) {
+  if (value < 0) { Q_EMIT errorOccurred("err"); return; }
+  doSomething();
+}
+void MyWidget::onReset() { Q_EMIT dataReady(0); }