BufferId leftBufferId = sourceModel()->data(source_left, NetworkModel::BufferIdRole).value<BufferId>();
BufferId rightBufferId = sourceModel()->data(source_right, NetworkModel::BufferIdRole).value<BufferId>();
if(config()) {
return config()->bufferList().indexOf(leftBufferId) < config()->bufferList().indexOf(rightBufferId);
} else
BufferId leftBufferId = sourceModel()->data(source_left, NetworkModel::BufferIdRole).value<BufferId>();
BufferId rightBufferId = sourceModel()->data(source_right, NetworkModel::BufferIdRole).value<BufferId>();
if(config()) {
return config()->bufferList().indexOf(leftBufferId) < config()->bufferList().indexOf(rightBufferId);
} else