[wp-trac] [WordPress Trac] #24256: Custom Post Types are hidden by default in the nav-menu page and there's no clean way to prevent that

[WordPress Trac]

#24256: Custom Post Types are hidden by default in the nav-menu page and there's no
clean way to prevent that
--------------------------+-----------------------------
 Reporter:  louisremi     |      Owner:
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Menus         |    Version:  trunk
 Severity:  normal        |   Keywords:  needs-patch
--------------------------+-----------------------------
 The function `wp_initial_nav_menu_meta_boxes` marks all non-built-in meta-
 boxes as hidden.

 This has some unexpected consequences: `register_post_type` has an option
 `show_in_nav_menus` and one would guess that setting this to `true` would
 display a meta-box for this post type on the nav-menu UI, but it doesn't.

 The real problem is that there is no clean way to prevent that behavior:
 the only hook available is `hidden_meta_boxes` and using it to un-hide
 meta-boxes also overrides screen-options actually selected by the user.
 (`default_hidden_meta_boxes` is never executed for nav-menus, because of
 `wp_initial_nav_menu_meta_boxes`).

 I'm not sure why `wp_initial_nav_menu_meta_boxes` was written in the first
 place, but it should at least provide a hook to add additional
 `$initial_meta_boxes`.

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Ticket URL: <http://core.trac.wordpress.org/ticket/24256>
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