QStackedLayout and setContentsMargins()

[Carlsberg]

setContentsMargins() seems to not have any effect on QStackedLayout.

This code results in no margin:

mainLayout = new QStackedLayout(this);
  mainLayout->setContentsMargins(20, 20, 20, 20);
  mainLayout->addWidget(image);
  mainLayout->addWidget(text);
  mainLayout->setCurrentIndex(0);

mainLayout = new QStackedLayout(this);
  mainLayout->setContentsMargins(20, 20, 20, 20);
  mainLayout->addWidget(image);
  mainLayout->addWidget(text);
  mainLayout->setCurrentIndex(0);

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while this has the correct 20 pixels margin

QVBoxLayout* mainLayout = new QVBoxLayout(this);
  mainLayout->setContentsMargins(20, 20, 20, 20);
  mainLayout->addWidget(image);

QVBoxLayout* mainLayout = new QVBoxLayout(this);
  mainLayout->setContentsMargins(20, 20, 20, 20);
  mainLayout->addWidget(image);

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Any idea how I can have the margin on QStackedLayout?

Thanks