src/vs/editor/common/cursor/cursorMoveCommands.ts/CursorMoveCommands/_moveDownByModelLines
class CursorMoveCommands:	private static _moveDownByModelLines(viewModel: IViewModel, cursors: CursorState[], inSelectionMode: boolean, linesCount: number): PartialCursorState[] {
		const result: PartialCursorState[] = [];
		for (let i = 0, len = cursors.length; i < len; i++) {
			const cursor = cursors[i];
			result[i] = CursorState.fromModelState(MoveOperations.moveDown(viewModel.cursorConfig, viewModel.model, cursor.modelState, inSelectionMode, linesCount));
		}
		return result;
	}