MC-40817: Unable to open fullscreen video using mobile browsers

Author: thiaramus

lib/web/fotorama/fotorama.js

@@ -1903,6 +1903,11 @@ fotoramaVersion = '4.6.4';
             });
         }
 
+        // check if current media object is YouTube or Vimeo video stream
+        function isVideo() {
+            return $((that.activeFrame || {}).$stageFrame || {}).hasClass('fotorama-video-container');
+        }
+
         function allowKey(key) {
             return o_keyboard[key];
         }
@@ -3149,8 +3154,7 @@ fotoramaVersion = '4.6.4';
             if (o_allowFullScreen && !that.fullScreen) {
 
                 //check that this is not video
-                var isVideo = $((that.activeFrame || {}).$stageFrame || {}).hasClass('fotorama-video-container');
-                if(isVideo) {
+                if(isVideo()) {
                     return;
                 }
 
@@ -3740,7 +3744,9 @@ fotoramaVersion = '4.6.4';
 
                 activeIndexes = [];
 
-                // detachFrames(STAGE_FRAME_KEY);
+                if (!isVideo()) {
+                    detachFrames(STAGE_FRAME_KEY);
+                }
 
                 reset.ok = true;