ASSERT in QTextTable when inserting a column before a spanned cell in the last column.

#include <QtGui>

int main( int argc, char** argv ){
 	QApplication app( argc, argv );
    QTextEdit *edit = new QTextEdit;
    QTextTable *table = edit->textCursor().insertTable(2,3);
    if (QApplication::arguments().size() > 1) { //do not crash
        table->insertColumns(1,1);
        table->mergeCells(0,2,2,2);
    } else {
        table->mergeCells(0,1,2,2);
        table->insertColumns(1,1);
    }
    edit->show();

 	return app.exec();
}