Show mail body on SymfonyMailCollector (#1571)

Author: erikn69

config/debugbar.php

@@ -226,6 +226,7 @@
         ],
         'mail' => [
             'timeline' => false,  // Add mails to the timeline
+            'show_body' => false,
             'full_log' => false,
         ],
         'views' => [

src/LaravelDebugbar.php

@@ -436,6 +436,9 @@ function (\Illuminate\Database\Events\ConnectionEstablished $event) {
                 if ($config->get('debugbar.options.mail.full_log')) {
                     $mailCollector->showMessageDetail();
                 }
+                if ($config->get('debugbar.options.mail.show_body')) {
+                    $mailCollector->showMessageBody();
+                }
 
                 if ($this->hasCollector('time') && $config->get('debugbar.options.mail.timeline')) {
                     $transport = $app['mailer']->getSymfonyTransport();