[wp-trac] [WordPress Trac] #47004: WordPress email subject update - phase 2

[WordPress Trac]

#47004: WordPress email subject update - phase 2
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 Reporter:  ramiy           |      Owner:  pento
     Type:  defect (bug)    |     Status:  assigned
 Priority:  normal          |  Milestone:  Awaiting Review
Component:  Mail            |    Version:
 Severity:  normal          |   Keywords:
  Focuses:  administration  |
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 WordPress send emails, using `wp_mail()` function, to inform the site
 admin when some important tasks are done and when it needs user
 confirmation.

 In #37940 we standardized **email subjects** used by WordPress. We updated
 subject texts, added unified translation comments and added site title as
 a prefix to all the email subjects.

 Now we should standardized the filters used to filter WordPress emails.
 Why? Because not all emails can be filtered.

 I prefer to do this in two steps:

 1. Separate the email subject from the `wp_mail()` function.
 2. Add new filters to filter the email subject.

 See the attached patches.

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Ticket URL: <https://core.trac.wordpress.org/ticket/47004>
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