void DocumentController::copyFromDiagram(const qmt::MDiagram *diagram)
{
    *m_diagramClipboard = m_diagramController->copyElements(m_diagramsManager->diagramSceneModel(diagram)->selectedElements(), diagram);
    emit diagramClipboardChanged(isDiagramClipboardEmpty());
}
void DocumentController::copyFromDiagram(const qmt::MDiagram *diagram)
{
    *_diagram_clipboard = _diagram_controller->copyElements(_diagrams_manager->getDiagramSceneModel(diagram)->getSelectedElements(), diagram);
    emit diagramClipboardChanged(isDiagramClipboardEmpty());
}