[wp-trac] [WordPress Trac] #45338: Gutenberg classic editor block is not showing custom mce buttons

[WordPress Trac]

#45338: Gutenberg classic editor block is not showing custom mce buttons
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 Reporter:  junixdev         |       Owner:  (none)
     Type:  defect (bug)     |      Status:  new
 Priority:  normal           |   Milestone:  5.0
Component:  Editor           |     Version:  5.0
 Severity:  normal           |  Resolution:
 Keywords:  has-screenshots  |     Focuses:
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Comment (by pento):

 [attachment:"45338.diff"] moves the TinyMCE settings filter to run later.

 Here's a cut down version of what the ThirstyAffiliates plugin is doing,
 which works with the patch.

 {{{#!php
 <?php
 add_action( 'init', function() {
         add_filter( 'mce_external_plugins', function( $mce_plugins ) {
                 $mce_plugins['foo'] = 'foo.js';
                 return $mce_plugins;
         } );
         add_filter( 'mce_buttons', function( $buttons ) {
                 $buttons[] = 'foo';
                 return $buttons;
         }, 5 );
 } );
 }}}

 This is still earlier than `edit-form-advanced.php` runs these filters,
 but well after `init`. @azaozz: are you aware of anyone adding hooks to
 these filters between `init` and when `edit-form-advanced.php` calls
 `wp_editor()`?

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Ticket URL: <https://core.trac.wordpress.org/ticket/45338#comment:7>
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