1. add the following line in testtreeview.c after the treeview is created, make
and run:

gtk_tree_selection_set_mode (gtk_tree_view_get_selection (GTK_TREE_VIEW (tv)),
GTK_SELECTION_MULTIPLE);

2. click on the first row
3. press and hold shift and press mouse button on fifth row
4. without releasing shift start dragging
--> only a single row (the fifth row) appears to be dragged

5. drop the row(s?) between two rows lower down
--> only the dragged row is moved in the tree, the rest remain in place
--> the selection no longer includes the dropped row


It should be possible to drag multiple rows within the treeview and the
selection shouldn't change as the result of the drop.