Method undo

src/Gui/Document.cpp:2969–2981

Will UNDO one or more steps

/// Will UNDO one or more steps
void Document::undo(int iSteps)
{
    Base::FlagToggler<> flag(d->_isTransacting);

    if (!checkTransactionID(true, iSteps)) {
        return;
    }

    for (int i = 0; i < iSteps; i++) {
        getDocument()->undo();
    }
    App::GetApplication().signalUndo();
}

/// Will REDO one or more steps
void Document::redo(int iSteps)