QTableWidget horizontal scrollbar not display when only 1 column

When a QTableWidget only has only 1 column, and header property SectionResizeMode

 set to QHeaderView::ResizeToContents, property HorizontalScrollMode set to QAbstractItemView::ScrollPerItem,

then insert a row has long text.

Expect: There should appear a horizontal scrollbar so user can read all content in the column.

Actual Happened: No horizontal scrollbar appear, although the column width be resize to content, no way to see them...

a possible solution for this: 

QTableWidget* tw = ui->tableWidget;
tw->setHorizontalScrollMode(QAbstractItemView::ScrollPerPixel);

Just set HorizontalScrollMode to QAbstractItemView::ScrollPerPixel.

The same bug reported for QTableView on Qt 4.8, see QTBUG-27993.

Test case uploaded as a rar file.

 I understand the reason of this, the mode ScrollPerItem behaviour is undifined when only 1 column exists. Please fix it, maybe update the document or code, thanks a lot.