Disable exercise link if it was disabled.

main/exercise/exercise.class.php

@@ -8418,7 +8418,16 @@ class Exercise
 
         // Url link.
         $grid->getColumn('title')->manipulateRenderCell(
-            function ($value, $row, $router) use ($course, $sessionId) {
+            function ($value, $row, $router) use ($course, $session, $sessionId) {
+                /** @var CQuiz $exercise */
+                $exercise = $row->getEntity();
+                $link = $exercise->getFirstResourceLinkFromCourseSession($course, $session);
+
+                $attributes = [];
+                if ($link && $link->isDraft()) {
+                    $attributes['class'] = ' text-muted ';
+                }
+
                 $url = $router->generate(
                     'legacy_main',
                     [
@@ -8428,7 +8437,8 @@ class Exercise
                         'exerciseId' => $row->getField('id'),
                     ]
                 );
-                return Display::url($value, $url);
+
+                return Display::url($value, $url, $attributes);
             }
         );
 

src/CoreBundle/Entity/Resource/ResourceLink.php

@@ -328,11 +328,39 @@ class ResourceLink
      */
     public function setVisibility(int $visibility): ResourceLink
     {
+        if (!in_array($visibility, self::getVisibilityList())) {
+            throw new \LogicException('The visibility is not valid');
+        }
+
         $this->visibility = $visibility;
 
         return $this;
     }
 
+    /**
+     * @return bool
+     */
+    public function isPublished()
+    {
+        return $this->getVisibility() === self::VISIBILITY_PUBLISHED;
+    }
+
+    /**
+     * @return bool
+     */
+    public function isPending()
+    {
+        return $this->getVisibility() === self::VISIBILITY_PENDING;
+    }
+
+    /**
+     * @return bool
+     */
+    public function isDraft()
+    {
+        return $this->getVisibility() === self::VISIBILITY_DRAFT;
+    }
+
     /**
      * @return $this
      */