[wp-trac] [WordPress Trac] #28512: Make the post thumbnail size filterable for the Featured Image meta box

[WordPress Trac]

#28512: Make the post thumbnail size filterable for the Featured Image meta box
-----------------------------+------------------------------
 Reporter:  DrewAPicture     |       Owner:
     Type:  enhancement      |      Status:  new
 Priority:  normal           |   Milestone:  Awaiting Review
Component:  Post Thumbnails  |     Version:
 Severity:  normal           |  Resolution:
 Keywords:  has-patch        |     Focuses:
-----------------------------+------------------------------

Comment (by SergeyBiryukov):

 > Currently, the only way to change the size is by duplicating the code in
 `_wp_post_thumbnail_html` on the `admin_post_thumbnail_html` hook.

 You can actually use `image_downsize` filter instead:
 {{{
 function change_featured_image_size_in_admin_28512( $downsize, $id, $size
 ) {
         if ( ! is_admin() || ! get_current_screen() || 'edit' !==
 get_current_screen()->parent_base ) {
                 return $downsize;
         }

         remove_filter( 'image_downsize', __FUNCTION__, 10, 3 );

         $image = image_downsize( $id, 'medium' );

         add_filter( 'image_downsize', __FUNCTION__, 10, 3 );

         return $image;
 }
 add_filter( 'image_downsize', 'change_featured_image_size_in_admin_28512',
 10, 3 );
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/28512#comment:3>
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