Paint issue with QTableView and QAbstractTableModel

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Hello,
I have created a custom data model for a QTableview. I use the function below to append lines in the model (it is a logger widget). When I do several subsequent calls to that function, the widget appears to paint the wrong content for some cells. It even occured one time that a cell was half paint with a content and half with another content. According to the test with "isGuiThread", every call is done on the gui thread. Is there something I'm doing wrong when I insert and remove lines?

Thanks.

@void DataModel::appendLog(LogEventPtr event)
{
{
const bool isGuiThread =
QThread::currentThread() == QCoreApplication::instance()->thread();
if(!isGuiThread)
event->Message += QString::fromLatin1(" [Bad thread]");

beginInsertRows(QModelIndex(), static_cast<int>(mMessageQueue.size()),
    static_cast<int>(mMessageQueue.size()));
mMessageQueue.push_back(event);
endInsertRows();
if(mMaxLogLength)
{
  int lRowToRemove = static_cast<int>(mMessageQueue.size()) - mMaxLogLength;
  if(lRowToRemove > 0)
  {
    beginRemoveRows(QModelIndex(), 0, lRowToRemove - 1);
    mDroppedEntriesCount += lRowToRemove;
    for(int i = 0; i < lRowToRemove; ++i)
    {
      mMessageQueue.pop_front();
    }
    endRemoveRows();
  }
}

}
}@
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