Ticket #50185: 50185.diff

src/js/_enqueues/admin/media.js

@@ -147 +147 @@
                 if ( $mediaGridWrap.length && window.wp && window.wp.media ) {
                         settings = _wpMediaGridSettings;
 
-                        window.wp.media({
+                        var frame = window.wp.media({
                                 frame: 'manage',
                                 container: $mediaGridWrap,
                                 library: settings.queryVars
                         }).open();
+
+                        // Fire a global ready event.
+                        $mediaGridWrap.trigger( 'wp-media-grid-ready', frame );
                 }
 
                 // Prevents form submission if no post has been selected.