Ticket #20694: 20694.patch

wp-admin/includes/class-wp-theme-install-list-table.php

@@ -220 +220 @@
                                 break;
                 }
 
-                $actions[] = '<a class="install-theme-preview" href="#" title="' . esc_attr( sprintf( __( 'Preview %s' ), $name ) ) . '">' . __( 'Preview' ) . '</a>';
+                $actions[] = '<a class="install-theme-preview" href="' . esc_url( $preview_url ) . '" title="' . esc_attr( sprintf( __( 'Preview %s' ), $name ) ) . '">' . __( 'Preview' ) . '</a>';
 
                 $actions = apply_filters( 'theme_install_actions', $actions, $theme );