Remove never-used commented out code in nav-menus.php update add menu block

[garrett-eclipse]

Hello,

While working on #44286 I noticed there was a piece of commented out code;

<?php
// $messages[] = '<div id="message" class="updated"><p>' . sprintf( __( '<strong>%s</strong> has been created.' ), $nav_menu_selected_title ) . '</p></div>';

Looking into it the piece of code was only used in a patch that never saw the light of day, instead in changeset [23810] for ticket #23770 it was added already commented out.

This code isn't needed as directly after it a wp_redirect is run so the message handler never executes in this case.

[garrett-eclipse]

Patch to remove unneeded commented out code.

[garrett-eclipse]

49967.diff removes the code.

[audrasjb]

Thanks for catching this. Moving to milestone 5.5.
Patch looks good to go.

[SergeyBiryukov]

In 47605:

Menus: Remove unused commented out code in wp-admin/nav-menus.php.

Props garrett-eclipse, audrasjb.
Fixes #49967.