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/diffeditorwidget.h

@@ -83,6 +83,10 @@ public:
     void setDiff(const QList<DiffFilesContents> &diffFileList, const QString &workingDirectory = QString());
     QTextCodec *codec() const;
 
+#ifdef WITH_TESTS
+    void testAssemblyRows();
+#endif // WITH_TESTS
+
 public slots:
     void setContextLinesNumber(int lines);
     void setIgnoreWhitespaces(bool ignore);