// use the style to determine a decent size
int h = qMin(qMax((int)document()->size().height() + scrollBarHeight, minPixelHeight), maxPixelHeight) + 2 * frameWidth();
+#if QT_VERSION < 0x050000
QStyleOptionFrameV2 opt;
+#else
+ QStyleOptionFrame opt;
+#endif
opt.initFrom(this);
opt.rect = QRect(0, 0, 100, h);
opt.lineWidth = lineWidth();