scrollBar in tabWidgets

[jpn]

Try this:

void FrameInfo::addInfo(QString infoName, double val)
{
    QHBoxLayout* infoLayout = new QHBoxLayout; // (holder); <-- remove parent, holder already has a layout installed (produces warning)
    ...
    holder->adjustSize(); // <-- add this as last statement of addInfo()
}

void FrameInfo::addInfo(QString infoName, double val)
{
    QHBoxLayout* infoLayout = new QHBoxLayout; // (holder); <-- remove parent, holder already has a layout installed (produces warning)
    ...
    holder->adjustSize(); // <-- add this as last statement of addInfo()
}

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