restore removeAction per item, not per index => segfaults are gone

GUI/View/Data/DatafilesSelector.cpp

@@ -206,7 +206,8 @@ QList<QAction*> DatafilesSelector::getOverlayActions(const QModelIndex& index, b
     removeAction->setIcon(QIcon(":/images/delete.svg"));
     removeAction->setIconText("Remove");
     removeAction->setToolTip("Remove this data");
-    connect(removeAction, &QAction::triggered, [this, row = index.row()] {
+    connect(removeAction, &QAction::triggered, [this, item] {
+        int row = m_qmodel->indexForItem(item).row();
         m_qmodel->removeDatafileItemAt(row);
         gDoc->setModified();
     });