Method undo

src/frontend/MainWin.cpp:2280–2294

}

void MainWin::undo() {
	WAIT_CURSOR;
	m_project->undoStack()->undo();
	m_redoAction->setEnabled(true);

	const int index = m_project->undoStack()->index();
	if (index == 0)
		m_undoAction->setEnabled(false);

	const bool changed = (index != undoStackIndexLastSave);
	m_saveAction->setEnabled(changed);
	m_project->setChanged(changed);
	updateTitleBar();
	RESET_CURSOR;
}

void MainWin::redo() {
	WAIT_CURSOR;