Custom widget won't size properly in a table cell

[zeroknowledge]

Hello.

I'm trying to use a custom widget as an editor in a QTableView's cell, but for some very obscure reason (to me), the custom widget won't size properly. However, when I replace my custom widget with a simple QPushButton, the component is now sized as it should, filling the whole cell. See the attachments.

Here's the important code:

This is how I create my custom widget

CBrowseWidget::CBrowseWidget(QWidget* parent) : QWidget(parent)
{
	QHBoxLayout* horizontalLayout = new QHBoxLayout();
	horizontalLayout->setSpacing(0);
	horizontalLayout->setObjectName("horizontalLayout");
 
	m_pathLineEdit = new QLineEdit(this);
    m_pathLineEdit->setObjectName("pathLineEdit");
 
	QToolButton* browseToolButton = new QToolButton(this);
	browseToolButton->setObjectName("browseToolButton");
	browseToolButton->setText("...");
 
	horizontalLayout->addWidget(m_pathLineEdit);
	horizontalLayout->addWidget(browseToolButton);
 
	this->setLayout(horizontalLayout);
	this->setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred));
}

CBrowseWidget::CBrowseWidget(QWidget* parent) : QWidget(parent)
{
	QHBoxLayout* horizontalLayout = new QHBoxLayout();
	horizontalLayout->setSpacing(0);
	horizontalLayout->setObjectName("horizontalLayout");
	
	m_pathLineEdit = new QLineEdit(this);
    m_pathLineEdit->setObjectName("pathLineEdit");

	QToolButton* browseToolButton = new QToolButton(this);
	browseToolButton->setObjectName("browseToolButton");
	browseToolButton->setText("...");

	horizontalLayout->addWidget(m_pathLineEdit);
	horizontalLayout->addWidget(browseToolButton);
	
	this->setLayout(horizontalLayout);
	this->setSizePolicy(QSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred));
}

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And here's the delegate code:

CPathItemDelegate::CPathItemDelegate() : QItemDelegate()
{
}
 
QWidget * CPathItemDelegate::createEditor ( QWidget * parent, const QStyleOptionViewItem & option, const QModelIndex & index ) const
{
        // return CBrowseWidget(parent); THIS DOES NOT WORK!!
	return new QPushButton("test", parent); // THIS WORKS!!
}
 
void CPathItemDelegate::updateEditorGeometry ( QWidget * editor, const QStyleOptionViewItem & option, const QModelIndex & index ) const
{
	editor->setGeometry(option.rect);
}

CPathItemDelegate::CPathItemDelegate() : QItemDelegate()
{
}

QWidget * CPathItemDelegate::createEditor ( QWidget * parent, const QStyleOptionViewItem & option, const QModelIndex & index ) const
{
        // return CBrowseWidget(parent); THIS DOES NOT WORK!!
	return new QPushButton("test", parent); // THIS WORKS!!
}

void CPathItemDelegate::updateEditorGeometry ( QWidget * editor, const QStyleOptionViewItem & option, const QModelIndex & index ) const
{
	editor->setGeometry(option.rect);
}

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Any ideas?

---

Added after 12 minutes:

Answering to myself: horizontalLayout->setContentsMargins(0, 0, 0, 0); did the trick...

[high_flyer]

try setting the margins:
setContentsMargins()