You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: ft_appendlayout.m
    path of file: ./repos/fecgsyn/subfunctions/data-generation/libs/fieldtrip
    
    the code of the file until where you have to start completion: function [combined] = ft_appendlayout(cfg, varargin)

% FT_APPENDLAYOUT concatenates multiple layout descriptions that have been constructed
% separately.
%
% Use as
%   combined = ft_appendlayout(cfg, layout1, layout2, ...)
% where the input layouts result from FT_PREPARE_LAYOUT and the configuration
% should contain
%   cfg.direction = string, 'horizontal' or 'vertical' (default = 'horizontal'
    
function
ft_postamble debug
ft_postamble trackconfig
ft_postamble previous varargin
ft_postamble provenance combined
ft_postamble history combined
ft_postamble savevar combined

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% SUBFUNCTION
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
function layout = shiftlayout(layout, dx, dy)
layout.pos(:,1) = layout.pos(:,1) + dx;
layout.pos(:,2) = layout.pos(:,2) + dy;
for i=1:numel(layout.mask)
  layout.mask{i}(:,1) = layout.mask{i}(:,1) + dx;
  layout.mask{i}(:,2) = layout.mask{i}(:,2) + dy;
end