Signal dataChanged breaks QListView in grid layout

Hello, I have a problem with a QListView in IconMode using a grid layout.

When displayed for the first time, everything works like a charm (http://hpics.li/afafe3d), but if the underlying model updates it's content (using signal dataChanged), the updated items don't respect the grid size policy (http://hpics.li/035dcbf). Using model reset, the layout keeps it's integrity (but it messes up the selection model).

Is this a bug or am I doing something wrong ?

QListView initialization:

  //...
  ui -> listView -> setMovement(QListView::Static);
  ui -> listView -> setResizeMode(QListView::Adjust);
  ui -> listView -> setViewMode(QListView::IconMode);
  ui -> listView -> setGridSize( QSize(150, 100));
  ui -> listView -> setWrapping(true);
  ui -> listView -> setWordWrap(true);
  ui -> listView -> setMinimumHeight(100);
  //...

Use dataChanged in model, breaks the grid layout:

  //...
  int index = storageUnits.indexOf(unit);

  if(index >= 0) {
    QModelIndex idx = createIndex(index, 0);
    emit dataChanged(idx, idx);
  }
}

Use reset in model, layout OK but impact other features of the app:

  //...
  beginResetModel();
  endResetModel();

Please find attached a small example illustrating this behaviour (based on QStringListModel for the sake of conciseness)