QWindows11Style: Align QSpinBox rect to match QLineEdits rect

The content rects for QSpinBoxes were smaller than QLineEdits rects for
UI elements that should have the same size. This patch increases the
content rect for QSpinBoxes.

Task-number: QTBUG-132261
Pick-to: 6.9 6.8
Change-Id: I59e752b719399c5845ab3ef81c6e271deda16273
Reviewed-by: Christian Ehrlicher <ch.ehrlicher@gmx.de>

src/plugins/styles/modernwindows/qwindows11style.cpp

@@ -253,14 +253,15 @@ void QWindows11Style::drawComplexControl(ComplexControl control, const QStyleOpt
                               sb, sb->rect.size());
             if (cp.needsPainting()) {
                 if (sb->frame && (sub & SC_SpinBoxFrame)) {
+                    const qreal sublineOffset = secondLevelRoundingRadius + 2.0;
                     cp->save();
                     cp->setClipRect(option->rect.adjusted(-2, -2, 2, 2));
                     cp->setPen(editSublineColor(option, colorSchemeIndex));
-                    cp->drawLine(option->rect.bottomLeft() + QPointF(7, -0.5),
-                                 option->rect.bottomRight() + QPointF(-7, -0.5));
+                    cp->drawLine(option->rect.bottomLeft() + QPointF(sublineOffset, 0.5),
+                                 option->rect.bottomRight() + QPointF(-sublineOffset, 0.5));
                     cp->restore();
                 }
-                const QRectF frameRect = QRectF(option->rect).adjusted(2.5, 2.5, -2.5, -2.5);
+                const QRectF frameRect = QRectF(option->rect).marginsRemoved(QMarginsF(1.5, 1.5, 1.5, 1.5));
                 const QBrush fillBrush = option->palette.brush(QPalette::Base);
                 cp->setBrush(fillBrush);
                 cp->setPen(QPen(highContrastTheme == true ? sb->palette.buttonText().color()