Issue #3511186 by grimreaper: Media Library currentSelection not reset properly

(cherry picked from commit 19f88bd3)

core/modules/media_library/js/media_library.ui.js

@@ -410,7 +410,9 @@
         return;
       }
       window.addEventListener('dialog:afterclose', () => {
-        Drupal.MediaLibrary.currentSelection = [];
+        // This empty the array while keeping the existing array reference,
+        // to keep event listeners working.
+        Drupal.MediaLibrary.currentSelection.length = 0;
       });
     },
   };