Ticket #22718: 22718.diff

wp-includes/js/media-models.js

@@ -858 +858 @@
 
                         // If single has changed, fire an event.
                         if ( this._single !== previous ) {
-                                if ( previous )
+                                if ( previous ) {
                                         previous.trigger( 'selection:unsingle', previous, this );
+
+                                        // If the model was already removed, trigger the collection
+                                        // event manually.
+                                        if ( ! this.getByCid( previous.cid ) )
+                                                this.trigger( 'selection:unsingle', previous, this );
+                                }
                                 if ( this._single )
                                         this._single.trigger( 'selection:single', this._single, this );
                         }