message: forgot return
diff: @@ -366,6 +366,7 @@ LineCount Grid<Cell>::scrollUp(LineCount linesCountToScrollUp, GraphicsAttribute
  maxHistoryLineCount_ += linesCountToScrollUp;
  for ([[maybe_unused]] auto const _: ranges::views::iota(0, unbox<int>(linesCountToScrollUp)))
  lines_.emplace_back(defaultLineFlags(), TrivialLineBuffer { pageSize_.columns, GraphicsAttributes {} });
  + return scrollUp(linesCountToScrollUp,_defaultAttributes);
  }
  // TODO: ensure explicit test for this case
  rotateBuffersLeft(linesCountToScrollUp);
  