///
bool hasRedoStack() const;
- /// open a new group of undo operations. Groups can be nested.
+ /// open a new group of undo operations.
+ /**
+ * Groups can be nested. Such a nested group e.g. { {} {} } is undone in
+ * a single step. This means you can add a group whenever you are not sure.
+ */
void beginUndoGroup();
/// end the current undo group.