[Mime] use isRendered method to ensure we can avoid rendering an emai… #59592
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…l twice
Following up my comment on https://github.com/symfony/symfony/pull/47075/files.
I would recommend using the method TemplatedEmail::isRendered() the same way it is used in AbstractTransport.php.
Keeping like this prevents subclass of TemplatedEmail with computed html template to not be rendered twice, such as NotificationEmail.
This change will allow developers to create a subclass of template emails and render them before sending them async, without rendering them twice.