CRM-21197 Convert from html to plain text AFTER token substitution has happened - take 2

[michaelmcandrew]

Overview

This is a second attempt at addressing CRM-21197. It is exactly the same as the first attempt (which was initially merged and then rejected) but is now accompanied by a patch to Flexmailer.

Is essence, the basis for the patch is as follows:

When no plain text version of an email is submitted, conversion from HTML to plain text should happen once, using the full HTML of the HTML version of the email after token substitution and click tracking.

@totten, in #10998, you suggested that TokenRow::format might provide the fuctionality we need to handle plain text tokens, but I don't think they are applicable in this use case. I think they are useful when the message is plain text but not in this case, when the message is HTML that needs to be converted to plain text.

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• CRM-21197: Convert from html to plain text AFTER token substitution has happened

[michaelmcandrew]

jenkins test this please

[michaelmcandrew]

see full discussion in https://lab.civicrm.org/dev/mail/issues/3

[colemanw]

@michaelmcandrew looks like a related test failure in the mailing system.

[eileenmcnaughton]

@michaelmcandrew this stalled on a related test fail - & I think from lack of current enthusiasm? I'd lean towards closing & re-opening when you find a revitalised enthusiasm for it