[wp-trac] [WordPress Trac] #33026: Add option filter for wp_dropdown_categories()

[WordPress Trac]

#33026: Add option filter for wp_dropdown_categories()
-----------------------------+-----------------------------
 Reporter:  theMikeD         |      Owner:
     Type:  feature request  |     Status:  new
 Priority:  normal           |  Milestone:  Awaiting Review
Component:  Taxonomy         |    Version:  4.2.2
 Severity:  normal           |   Keywords:
  Focuses:  administration   |
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 I have a case in which I have a two-level hierarchical taxonomy. The only
 way to enforce this two-level hierarchy is to filter the parent list to
 top/parent terms only.

 For example, given this

 {{{
 parent term 1
     child term 11
     child term 12
 parent term 2
     child term 21
 }}}
 the only terms that should show up in the 'Parent' list would be `parent
 term 1` and `parent term 2`

 On the term edit screen, this is handled by using the
 `taxonomy_parent_dropdown_args` and `quick_edit_dropdown_pages_args`
 filters to add the `depth` parameter, which works great for this purpose.

 But I can't do this for the list presented when a new term is added in the
 post-edit screen because a similar filter does not exist in
 `wp_dropdown_categories()` (the function that creates the list in the post
 edit screen). This in turn means that I have to create a new metabox from
 scratch, with a custom walker and an almost verbatim copy of
 `post_categories_meta_box()` function just to add this parameter into the
 args sent to `wp_dropdown_categories()` which is an ugly hacky workaround.

 So lets be consistent and add the new filter.

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Ticket URL: <https://core.trac.wordpress.org/ticket/33026>
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