How to make QListView consume the space when rows decrease in height on h-resize?

[JmpNop]

A single QTextDocument is probably not an option, since I suspect all the HTML /CSS parsing to be quite slow. I didn't measure anyhing yet, though. Still busy with other stuff. Richtext is not my friend. ^^
Have a happy new year

[JmpNop]

Since I had the same problem (rows' heights) with a QTreeView now, I did some digging through Qt's source code.
Look what I've found:

.../qtbase/src/widgets/itemviews$ grep -n sizeHintChanged *
qabstractitemdelegate.cpp:163:    \fn void QAbstractItemDelegate::sizeHintChanged(const QModelIndex &index)
qabstractitemdelegate.h:120:    void sizeHintChanged(const QModelIndex &);
qabstractitemview.cpp:834:            disconnect(d->itemDelegate, SIGNAL(sizeHintChanged(QModelIndex)), this, SLOT(doItemsLayout()));
qabstractitemview.cpp:843:            connect(delegate, SIGNAL(sizeHintChanged(QModelIndex)), this, SLOT(doItemsLayout()), Qt::QueuedConnection);

.../qtbase/src/widgets/itemviews$ grep -n sizeHintChanged *
qabstractitemdelegate.cpp:163:    \fn void QAbstractItemDelegate::sizeHintChanged(const QModelIndex &index)
qabstractitemdelegate.h:120:    void sizeHintChanged(const QModelIndex &);
qabstractitemview.cpp:834:            disconnect(d->itemDelegate, SIGNAL(sizeHintChanged(QModelIndex)), this, SLOT(doItemsLayout()));
qabstractitemview.cpp:843:            connect(delegate, SIGNAL(sizeHintChanged(QModelIndex)), this, SLOT(doItemsLayout()), Qt::QueuedConnection);

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That's all. See how the QModelIndex that is passed to sizeHintChanged is ignored? Any sizeHintChanged signal just triggers a relayout.
Even more interesting is the doItemsLayout() slot. It is public and available in all of Qt's item view widgets, but it is not documented. That's exactly what I was looking for
Someone asked if he could rely on that on another forum a few years ago. So I'm going to repeat the question here.

[wysota]

If it is undocumented and not a virtual method then you cannot expect the method to work in future Qt releases. Of course it is unlikely that it goes away until Qt 6.0.

[JmpNop]

It's virtual. From qabstractitemview.h:

public Q_SLOTS:
    virtual void reset();
    virtual void setRootIndex(const QModelIndex &index);
    virtual void doItemsLayout();
    virtual void selectAll();

public Q_SLOTS:
    virtual void reset();
    virtual void setRootIndex(const QModelIndex &index);
    virtual void doItemsLayout();
    virtual void selectAll();

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