Customizer Menus: Duplicate item in Menu Location selection

[tywayne]

Steps to reproduce:

1. Create a new menu in customizer
2. Save and Publish
3. Navigate to Menu Locations
4. Opening <select> shows duplicate

gif of steps here: ​https://cloudup.com/c0NgUy11GdP

The duplicate item in menu location <select> has a temp id, so most likely not being correctly replaced on save.

[westonruter]

​https://github.com/xwp/wordpress-develop/pull/109

[westonruter]

@tywayne: Good catch! So this is an amendment to #32814.

Please test 33176.diff​. It updates the nav_menu_locations controls to remove the placeholder menu option when the menu is inserted.

[tywayne]

Replying to westonruter:

@tywayne: Good catch! So this is an amendment to #32814.

Please test 33176.diff​. It updates the nav_menu_locations controls to remove the placeholder menu option when the menu is inserted.

Looks good to me. Working as expected now, thanks!

[westonruter]

In 33496:

Customizer: Update nav_menu_locations[...] controls to remove placeholder menus from the dropdown options upon Save & Publish.

See #32814.
Fixes #33176.