QmitkDataManagerView::NodeTreeViewRowsRemoved() is meant to "expand" the parent of a newly added item in Data Manager's tree view.

While the method is calling the QTreeView's correct method to do so, it provides the wrong QModelIndex. This index comes from the original model but is filtered through the m_FilterModel.

Consequently, indices should be converted via m_FilterModel. OR, simpler, we map the slot NodeTreeViewRowsRemoved to the corresponding signal of m_FilterModel. I implemented the second version.