When setTabPosition set to South (bottom) for QTabWidget - rightmost tab in TabBar doesn't have the right border when this tab isn't selected. Screenshot attached

Steps to reproduce:

1. Create new project (based on Widget in my case)
2. Create QTabWidget with a couple of tabs
3. Set setTabPosition to South 
4. Compile and observe last/rightmost tab appearance in TabBar 

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    QTabWidget *tabWidget = new QTabWidget;
    QLabel *lbl1 = new QLabel("One");
    QLabel *lbl2 = new QLabel("Two");

    tabWidget->setTabPosition(QTabWidget::South);
    tabWidget->addTab(lbl1, "One");
    tabWidget->addTab(lbl2, "Two");

    QVBoxLayout *layout = new QVBoxLayout;
    layout->addWidget(tabWidget);
    setLayout(layout);
}

(notice absence of border to the right of  tab titled "Two" in the TabBar)

Note: this behavior does not reproduce for other directions (North, East or West)