Problem with ProxyModel merging models with QSortFilterProxyModel.

[SvenA]

Hmmm, that's correct. But this changes nothing. It's still does not work.
If I understand it correctly, I have to do the mapping in both slots, but interestingly it works without this mapping the the rowsAboutToBeInserted() slot. I tried to remove the mapping from rowsAboutToBeRemoved() temporarily, but no change again.

Because I think it is correct to map it in both functions, I added the missing mapping to rowsAboutToBeInserted() too.

Now my rowsAboutToBeInsertedSlot() slot looks like:

void MergeProxyModel::rowsAboutToBeInsertedSlot(const QModelIndex &parent, int first, int last)
{
  QAbstractTableModel *smodel = qobject_cast<QAbstractTableModel *>(sender());
  const int offset = getOffset(smodel);
  beginInsertRows(parent, first + offset, last + offset);
}

void MergeProxyModel::rowsAboutToBeInsertedSlot(const QModelIndex &parent, int first, int last)
{
  QAbstractTableModel *smodel = qobject_cast<QAbstractTableModel *>(sender());
  const int offset = getOffset(smodel);
  beginInsertRows(parent, first + offset, last + offset);
}

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Would a small example application to test it, help?