When synchronizing the current state of the edited data to some storage, it would be nice to reset the isModified state of the widget to reflect the new sync state. As after that the current state is not really "modified" relative to the other state.

And while allowing to reset the state, it would be nice if the change of this state would be also reflected by a signal. Compare also QTextDocument::modified

The QUndoStack::isClean might be something to use for the implementation?