aizatto

I am the developer of this plugin. Could you please tell me how to reproduce this?

Which theme are you using?
Are you using it with a unique widget?

I’ve got somewhere with this.

2 files need to be changed.

• Open /wp-includes/formatting.php
• Go to function wp_richedit_pre.
• Replace it with:

  function wp_richedit_pre($text) {
  	// Filtering a blank results in an annoying <br />\n
  	if ( empty($text) ) return apply_filters('richedit_pre', '');
  
  	$output = convert_chars($text);
  	$output = wpautop($output);
  	$output = shortcode_unautop($output);
  	$output = htmlspecialchars($output, ENT_NOQUOTES);
  
  	return apply_filters('richedit_pre', $output);
  }

• Open /wp-content/plugins/tinymce-advanced/tinymce-advanced.php
• Go to function function tadv_htmledit.
• Replace it with:

  function tadv_htmledit($c) {
  		$tadv_options = get_option('tadv_options', array());
  
  		if ( isset($tadv_options['fix_autop']) && $tadv_options['fix_autop'] == 1 ) {
  			$c = str_replace( array('&', '<', '>'), array('&', '<', '>'), $c );
  			$c = wpautop($c);
  			$c = shortcode_unautop($c);
  			$c = htmlspecialchars($c, ENT_NOQUOTES);
  		}
  		return $c;
  	}

I hope that solves the problem for you!