Sergey Biryukov ee60c40806 Mail: Make sure the PHPMailer class is only required once if a plugin requires wp-includes/class-phpmailer.php directly. ...

Follow-up to [48033].

Props david.binda.
Fixes #50716. See #41750.
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git-svn-id: http://core.svn.wordpress.org/trunk@48292 1a063a9b-81f0-0310-95a4-ce76da25c4cd

2020-07-21 12:58:02 +00:00

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