[wp-trac] [WordPress Trac] #45250: Backward compatibility: Impossible to prefill a new post in WP 5.0

[WordPress Trac]

#45250: Backward compatibility: Impossible to prefill a new post in WP 5.0
--------------------------+-----------------------------
 Reporter:  Chouby        |      Owner:  (none)
     Type:  defect (bug)  |     Status:  new
 Priority:  normal        |  Milestone:  Awaiting Review
Component:  Editor        |    Version:  5.0
 Severity:  normal        |   Keywords:
  Focuses:                |
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 An important feature that Polylang provides to the users is to prefill the
 new translations with information coming from the original post. Every
 type of content can be prefilled: post fields, taxonomies and post metas.

 In WordPress 5.0-beta2-43852, the editor does not read informations filled
 int the global `$post` ( for post fields) or in the database ( for
 taxonomies and metas) for a new post.

 This issue had been reported during the development of Gutenberg in
 https://github.com/WordPress/gutenberg/issues/7000 and was partially fixed
 by https://github.com/WordPress/gutenberg/pull/10660 and
 https://github.com/WordPress/gutenberg/pull/10362
 but in WordPress 5.0, nothing works anymore.

 Here is a small plugin demonstrating the issue (you may need to change the
 thumbnail id for the test).

 {{{
 <?php

 /*
 Plugin name: Test Post Prefill
 */

 add_action( 'add_meta_boxes', function( $post_type, $post ) {
         if ( 'post-new.php' == $GLOBALS['pagenow'] ) {
                 $post->post_title     = 'Test post prefill';
                 $post->post_content   = 'Test post content prefill';
                 $post->menu_order     = 10;
                 $post->comment_status = 'open';
                 $post->ping_status    = 'closed';

                 wp_set_post_categories( $post->ID, 1 );
                 wp_set_post_tags( $post->ID, 'tag' );

                 set_post_thumbnail( $post->ID, 42 );

                 stick_post( $post->ID );
         }
 }, 10, 2 );
 }}}

 I'll also attach a picture with the test results.

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Ticket URL: <https://core.trac.wordpress.org/ticket/45250>
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