Need to call QTableView::invalidate() before hiding columns

[brixton]

I'm having trouble understanding why I need to call QTableView::invalidate() before I can hide columns in the view.

Here m_proxy is a subclassed QSortFilterProxyModel with a reimplemented filterAcceptsRow and m_view is just QTableView.

m_view->setColumnHidden(5, true);
qDebug() << m_view->isColumnHidden(5);
 
m_proxy->invalidate();
 
m_view->setColumnHidden(5, true);
qDebug() << m_view->isColumnHidden(5);

m_view->setColumnHidden(5, true);
qDebug() << m_view->isColumnHidden(5);

m_proxy->invalidate();

m_view->setColumnHidden(5, true);
qDebug() << m_view->isColumnHidden(5);

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The above code returns:

false
true

I am actually having trouble hiding columns elsewhere in my code which I how I stumbled on this curiosity.

Thanks for any explanations!