delete_item.c

GList* elements = gtk_icon_view_get_selected_items (mw->view);
int i = atoi(gtk_tree_path_to_string(elements->data));
      
const char* del_path = g_list_nth_data(thumbnail_path_list, i);

GtkTreeIter iter;
GtkTreePath* path = g_list_nth_data(elements,0);
gtk_tree_model_get_iter((GtkTreeModel*)mw->model, &iter, path);
gtk_list_store_remove(mw->model, &iter);

gtk_tree_path_free(path);
g_list_free(elements);