bugfix (#193)

Co-authored-by: Dominik Demuth <dominik.demuth@physik.tu-darmstadt.de>
Reviewed-on: IPKM/nmreval#193

src/gui_qt/data/datawidget/datawidget.py

@@ -532,11 +532,14 @@ class DataTree(QtWidgets.QTreeWidget):
     def uncheck_sets(self, sets: list[str]):
         self.blockSignals(True)
         iterator = QtWidgets.QTreeWidgetItemIterator(self)
+        self._checked_sets = set()
         while iterator.value():
             item = iterator.value()
             if item is not None:
                 if item.data(0, QtCore.Qt.UserRole) in sets:
                     item.setCheckState(0, QtCore.Qt.Unchecked)
+                else:
+                    self._checked_sets.add(item.data(0, QtCore.Qt.UserRole))
                 iterator += 1
         self.blockSignals(False)