Line breaks in message body result in 4 newlines instead of 2

[dgsiegel]

Description

Due to $body = preg_replace('/\R/u', "\n\n", $body); in https://github.com/craftcms/contact-form/blob/v2/src/Mailer.php#L216 (introduced with ae8dd32c53c6af2882efe0e8ab411880e44aaeb6), all newlines in a textarea field will be replaced by two newlines. Adding the following into the textarea field:

foo
bar

text after empty line

gives this:

foo

bar

text after empty line

Steps to reproduce

1. Add a contact form like described in the readme, e.g.

  {{ tag('textarea', {
        text: message.message ?? '',
        id: 'message',
        name: 'message',
    }) }}

2. Look at the resulting text version of the email.

Additional info

• Craft version: 3.7.2
• PHP version: 8

[brandonkelly]

Thanks for reporting! Just released 2.5.1 with a fix for this.