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Mails resembling HTML are corrupted

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Problem/Motivation

In \Drupal\Core\Mail\Plugin\Mail\PhpMail::format() there is a conversion from HTML to text which occurs without checking if the input is an instance of MarkupInterface. This causes corruption of a mail that was in fact plain text and contains text that resembles HTML.

E.g.

Today I learnt Greek letters alphaβ they are hard to write.
In HTML, ampersand must be written as &.
I saw your house and <wow> it is great.
If a<b and b<c then a<c.

Steps to reproduce

Install a contrib module that allows sending of messages in plain text format. An example is simplenews. Type a message like the example above.

Proposed resolution

Only call htmlToText() if the input implements MarkupInterface.

Remaining tasks

None.

User interface changes

None.

API changes

None.

Data model changes

None.

Release notes snippet

None.


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