Disable PresentationMode for certain problematic configurations

Instead of trying to hack around various browser defects, let's just disable PresentationMode in the affected browsers. This patch:

- Disables PresentationMode in IE11+ when the viewer is embedded; fixes 4711.

web/compatibility.js

@@ -562,3 +562,13 @@ if (typeof PDFJS === 'undefined') {
     PDFJS.maxCanvasPixels = 5242880;
   }
 })();
+
+// Disable fullscreen support for certain problematic configurations.
+// Support: IE11+ (when embedded).
+(function checkFullscreenSupport() {
+  var isEmbeddedIE = (navigator.userAgent.indexOf('Trident') >= 0 &&
+                      window.parent !== window);
+  if (isEmbeddedIE) {
+    PDFJS.disableFullscreen = true;
+  }
+})();

web/viewer.js

@@ -322,6 +322,9 @@ var PDFViewerApplication = {
         document.msFullscreenEnabled === false) {
       support = false;
     }
+    if (support && PDFJS.disableFullscreen === true) {
+      support = false;
+    }
 
     return PDFJS.shadow(this, 'supportsFullscreen', support);
   },