[REG] QTBUG-629 fix have some unrelated change which caused degradation.

https://bugreports.qt.io/browse/QTBUG-629 contains code review https://codereview.qt-project.org/c/qt/qtbase/+/99658 with comment  (https://codereview.qt-project.org/c/qt/qtbase/+/99658/comment/9aa7fdbe_84dbf84d)
From which we see that this change was unrelated to the bug.

"2 * " change caused regression in Tableau and we are reverting that part in each upgrade to keep views consistent. 

Would it be possible revert this change by removing "2 * " from the function 
int QHeaderView::minimumSectionSize() const
{
Q_D(const QHeaderView);
if (d->minimumSectionSize == -1)

{ QSize strut = QApplication::globalStrut(); int margin = 2 * style()->pixelMetric(QStyle::PM_HeaderMargin, nullptr, this); if (d->orientation == Qt::Horizontal) return qMax(strut.width(), (fontMetrics().maxWidth() + margin)); return qMax(strut.height(), (fontMetrics().height() + margin)); }

return d->minimumSectionSize;
}