html2text in Mailings doesn't fix ampersands
The Roundcube html2text module does not replace the ampersands in a URL at the bottom of a plain text mail. Tested with CiviCRM 4.6 as well as with 5.7.3. When searching the commits, it doesn't appear to be fixed in master.
Links: ------  https://www.somecivicrmsite.com/event/info?reset=1&id=100000
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