When looking for the first paragraph with content in a post,
it was matching the lightboxed image paragraph as "<p></p>".
Fix that and other potential empty paragraphs with the
p:not(:empty) selector.
Add a new selector to find the image links in lightboxed
images as valid content for emails.
If a post starts with a post quote and has no other text content,
then the email excerpt was the name of the person quoted and
nothing else. The intention was to show the contents of the
first paragraph or div after the quote.
With this change, a quote followed by an image will use the
image as the excerpt. A quote followed by a onebox will use the
onebox.
The spoiler alert plugin replaces spoiler text found in email excerpts with posts URL, which means it needs to have a reference to the post it's processing.
This change makes `email_excerpt` accepts an optional post param, which calls `PrettyText.format_for_email` which then triggers the `reduce_cooked` event that the plugin subscribes to.
This reduces chances of errors where consumers of strings mutate inputs
and reduces memory usage of the app.
Test suite passes now, but there may be some stuff left, so we will run
a few sites on a branch prior to merging
* Rearrange frontend to account for mailing list mode
* Allow update of user preference for mailing list frequency
* Add mailing list frequency estimate
* Simplify frequency estimate; disable activity summary for mailing list mode
* Remove combined updates
* Add specs for enqueue mailing list mode job
* Write mailing list method for mailer
* Fix linting error
* Account for stale topics
* Add translations for default mailing list setting
* One query for mailing list topics
* Fix failing spec
* WIP
* Flesh out html template
* First pass at text-based mailing list summary
* Add user avatar
* Properly format posts for mailing list
* Move make_all_links_absolute into Email::Styles
* Apply first_seen_at to user
* Send mailing list email summary hourly based on first_seen_at
* Branch and test cleanup
* Use existing mailing list mode estimate
* Fix failing specs
