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

tests/fixtures/cpp_qt_headers/MyWidgetPlain.cpp

@@ -0,0 +1,10 @@
+#include "MyWidgetPlain.h"
+
+MyWidgetPlain::MyWidgetPlain() {}
+MyWidgetPlain::~MyWidgetPlain() {}
+
+void MyWidgetPlain::doSomething() { onReset(); }
+int MyWidgetPlain::calculateValue(int a, int b) { return a + b; }
+void MyWidgetPlain::onButtonClicked() { int result = calculateValue(1, 2); }
+void MyWidgetPlain::onDataReceived(int value) { if (value < 0) return; doSomething(); }
+void MyWidgetPlain::onReset() {}