BC: Fix sort action.

src/View/BoundaryCondition/BCUndoCommand.py

@@ -99,7 +99,7 @@ class SortCommand(QUndoCommand):
         self._lst = lst
         self._reverse = _reverse
 
-        self.old = self._lst.copy()
+        self._old = self._lst.copy()
         self._indexes = None
 
     def undo(self):
@@ -109,7 +109,10 @@ class SortCommand(QUndoCommand):
         )
 
     def redo(self):
-        self._lst.sort(self._reverse)
+        self._lst.sort(
+            reverse=self._reverse,
+            key=lambda x: x.name
+        )
         if self._indexes is None:
             self._indexes = list(
                 map(

src/View/BoundaryCondition/BoundaryConditionWindow.py

@@ -202,7 +202,7 @@ class TableModel(QAbstractTableModel):
     def sort(self, _reverse, parent=QModelIndex()):
         self.layoutAboutToBeChanged.emit()
 
-        self._undo_stack.push(
+        self._undo.push(
             SortCommand(
                 self._lst, False
             )