FlowLayout uses too much height

[JoeAB]

I am trying to use the FlowLayout sample to create a docked panel with 26 same-size buttons. The buttons are positioned OK and also flow properly when the width of the application is changed.

However, the height of the panel remains constant and too large. I left these overridden functions as is, except for diagnostics.

int FlowLayout::heightForWidth(int width) const
{
int height = doLayout(QRect(0, 0, width, 0), true);
qDebug() << "heightForWidth(" << width << ") ht=" << height;
return height;
}

void FlowLayout::setGeometry(const QRect &rect)
{
QLayout::setGeometry(rect);
int height = doLayout(rect, false);
}

heightForWidth is only called once, using the width of roughly one button plus margins. The height calculated is for 26 rows (818 pixels), instead or 2 or 3 rows (105 or 136 pixels).

Is there an easy way to get the FlowLayout to use the calculated height?