Fix wrong diff output with span lines

Task-number: QTCREATORBUG-9494

Change-Id: Ica26e1448b1997e102648be58128f1be00c4905e
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Christian Stenger <christian.stenger@digia.com>

src/plugins/diffeditor/diffeditorplugin.h

@@ -65,6 +65,10 @@ public:
 private slots:
     void diff();
 
+#ifdef WITH_TESTS
+    void testAssemblyRows();
+#endif // WITH_TESTS
+
 private:
     QString getFileContents(const QString &fileName, QTextCodec *codec) const;