Fix problem that the default page size auto is not respected when pri…

…nt to PDF

src/js/models/document-options.js

@@ -88,12 +88,17 @@ class DocumentOptions {
                 url
             }));
         }
+        const userStyleSheetArray = convertStyleSheetArray(this.userStyleSheet());
+        if (this.pageStyle.pageSizeMode() == PageStyle.Mode.DEFAULT) {
+            // Put default page size auto. This is needed to output auto size PDF.
+            userStyleSheetArray.unshift({text: "@page{size:auto}"});
+        }
         // Do not include url
         // (url is a required argument to Viewer.loadDocument, separated from other options)
         return {
             fragment: this.fragment(),
             authorStyleSheet: convertStyleSheetArray(this.authorStyleSheet()),
-            userStyleSheet: convertStyleSheetArray(this.userStyleSheet())
+            userStyleSheet: userStyleSheetArray
         };
     }