docs: function _rightAlignRenderers(context) {
  	var dummy_renderer = plugin_api.findRendererByName(context, "dummy");
  
  	// find the length of the longest chain.
  	var longest = 0;
  	for (var i=0; i<context.files.length; i++)
  	{
  		var fi = context.files[i];
  		longest = Math.max(longest, fi.renderers.length);
  	}
  	// inject the dummy renderer to the left of the existing renderers
  	for (var i=0; i<context.files.length; i++)
  	{
  		var fi = context.files[i];
  		if (fi.renderers.length<longest)
  			fi.renderers = (new Array(longest - fi.renderers.length)).fill(dummy_renderer).concat(fi.renderers);
  	}
  }