Ticket #42205: 42205.patch

src/wp-admin/js/updates.js

@@ -1504 +1504 @@
 
                 $( 'body' ).addClass( 'modal-open' );
                 $modal.show();
+                /* FTP credentials dialog modal in not visible while trying to add a new theme as it was being blocked by body css visibility hidden */
+                $modal.css('visibility', 'visible');
                 $modal.find( 'input:enabled:first' ).focus();
                 $modal.on( 'keydown', wp.updates.keydown );
         };