Spin box in table cell too wide

class TestModel final : public QAbstractTableModel
{
 public:
 virtual int rowCount(const QModelIndex& pParent = QModelIndex()) const override { return 10; }
virtual int columnCount(const QModelIndex& pParent = QModelIndex()) const override { return 1; }
virtual QVariant data(const QModelIndex& pIndex, int pRole = Qt::DisplayRole) const override
 {
 if (pRole == Qt::DisplayRole || pRole == Qt::EditRole)
 return pIndex.row();
return QVariant();
 }
virtual QVariant headerData(int pSection, Qt::Orientation pOrientation, int pRole = Qt::DisplayRole) const override
 {
 if (pOrientation == Qt::Horizontal && pRole == Qt::DisplayRole)
 return "Heading";
 return QVariant();
 }
virtual Qt::ItemFlags flags(const QModelIndex& pIndex) const override
 {
 return QAbstractTableModel::flags(pIndex) | Qt::ItemIsEditable;
 }
virtual bool setData(const QModelIndex& pIndex, const QVariant& pValue, int pRole = Qt::EditRole) override
 {
 qDebug() << pRole << pIndex << pValue;
 return true;
 }
};

TestModel m;
QTableView w;
w.setModel(&m);
w.setColumnWidth(0, 50);
w.show();