reenable keyboardlock in fullscreenchange event

Author: sirux88

guacamole/src/main/frontend/src/app/client/services/guacFullscreen.js

@@ -52,23 +52,20 @@ angular.module('client').factory('guacFullscreen', ['$injector',
                 // check is browser is in fullscreen mode (may have failed in step above)
                 // if so additionally set keyboard lock mode to prevent execution of special keys 
                 // on local os (e.g. Win key, functions keys like F11(= default kex for browser fullsceen mode))
-                if(service.isInFullscreenMode())navigator.keyboard.lock();  
-                else navigator.keyboard.unlock();
+                
             }
         }
 
-        // attach to fullscreenevent and set keyboard lock 
-        // this is done by event, to 
-        // document.addEventListener('fullscreenchange', () => {
+        //attach to fullscreenevent and set keyboard lock 
+        //this is done by fullscreenchange event, to prevent browser errors
+        // (running this immediately after setting fullscreen throws errors)
+        document.addEventListener('fullscreenchange', () => {
 
-        //     if (navigator.keyboard){
-        //         if(service.isInFullscreenMode()){
-                     
-        //         }else{
-                    
-        //         }
-        //     }
-        // })
+            if (navigator.keyboard){
+                if(service.isInFullscreenMode())navigator.keyboard.lock();  
+                else navigator.keyboard.unlock();
+            }
+        })
 
         return service;
     }