Merge pull request #4958 from DavidYCZhou/master

windows egde bug fix

Author: swalters

src/features/exporter/js/exporter.js

@@ -995,7 +995,7 @@
             var exportData = self.getData(grid, rowTypes, colTypes);
             var docDefinition = self.prepareAsPdf(grid, exportColumnHeaders, exportData);
 
-            if (self.isIE()) {
+            if (self.isIE() || navigator.appVersion.indexOf("Edge") !== -1) {
               self.downloadPDF(grid.options.exporterPdfFilename, docDefinition);
             } else {
               pdfMake.createPdf(docDefinition).open();