message: Added new `hidden` property to `slide` (Issue
diff: @@ -4059,7 +4059,7 @@ var PptxGenJS = function(){
  function makeXmlSlide(objSlide) {
  // STEP 1: Generate slide XML - wrap generated text in full XML envelope
  var strXml = '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>'+CRLF;
  - strXml += '<p:sld xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main">';
  + strXml += '<p:sld xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main" xmlns:r="http://schemas.openxmlformats.org/officeDocument/2006/relationships" xmlns:p="http://schemas.openxmlformats.org/presentationml/2006/main"'+ (objSlide.slide.hidden ? ' show="0"' : '') +'>';
  strXml += gObjPptxGenerators.slideObjectToXml(objSlide);
  strXml += '<p:clrMapOvr><a:masterClrMapping/></p:clrMapOvr>';
  strXml += '</p:sld>';
  