[wp-trac] [WordPress Trac] #48734: Twenty Twenty: [em] tag with blank string inside ruins theme layout

[WordPress Trac]

#48734: Twenty Twenty: [em] tag with blank string inside ruins theme layout
-----------------------------------------+-----------------------
 Reporter:  derlynad                     |       Owner:  audrasjb
     Type:  defect (bug)                 |      Status:  accepted
 Priority:  normal                       |   Milestone:  5.3.1
Component:  Bundled Theme                |     Version:
 Severity:  normal                       |  Resolution:
 Keywords:  needs-patch has-screenshots  |     Focuses:
-----------------------------------------+-----------------------

Comment (by audrasjb):

 The issue doesn't appears anymore if I remove this bit of code from
 `functions.php`:

 {{{
 /**
  * Output Customizer settings in the classic editor.
  * Adds styles to the head of the TinyMCE iframe. Kudos to @Otto42 for the
 original solution.
  *
  * @param array $mce_init TinyMCE styles.
  *
  * @return array $mce_init TinyMCE styles.
  */
 function twentytwenty_add_classic_editor_customizer_styles( $mce_init ) {

         $styles = twentytwenty_get_customizer_css( 'classic-editor' );

         if ( ! isset( $mce_init['content_style'] ) ) {
                 $mce_init['content_style'] = $styles . ' ';
         } else {
                 $mce_init['content_style'] .= ' ' . $styles . ' ';
         }

         return $mce_init;

 }
 }}}

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Ticket URL: <https://core.trac.wordpress.org/ticket/48734#comment:2>
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