Fixes #14092

* Fixed emoji detection problem to append border

* Add tests

* Add missing semicolon

* Fixed wrong result when includes different variation selector

* Add missing semicolon

* Remove grapheme-splitter and Change emoji list to array from string

* Update comment

* Remove spaces

Co-authored-by: ThibG <thib@sitedethib.com>

Fixes #14018

* Split media cleanup from reject-media domain blocks to its own service

* Slightly improve ClearDomainMediaService error handling

* Lower DomainClearMediaWorker to lowest-priority queue

* Do not catch ActiveRecord::RecordNotFound in domain block workers

* Fix DomainBlockWorker spec labels

* Add some specs

* Change domain blocks to immediately mark accounts as suspended

Rather than doing so sequentially, account after account, while cleaning
their data. This doesn't change much about the time the block takes to
complete, but it immediately prevents interaction with the blocked domain,
while up to now, it would only be guaranteed when the process ends.

* Refactor list of emoji requiring added outlines so that it can be theme-specific

* Split inaccessible emoji to emoji requiring an outline and ones that can be inverted

* Drop the “silouhettes” from black emoji as they seem to have changed color

* Add inaccessible emojis list for the light theme

* Use bordered emoji variant instead of unreliable CSS

* Add visibility parameter in share page

* Restrict to default privacy

* FIX: filters ignore media descriptions

* remove parentheses to make codeclimate happy

* combine the text and run the regular expression only once.

https://github.com/tootsuite/mastodon/pull/13837#discussion_r431752581



* Fix use of “filter” instead of “compact”, fix coding style issues

Co-authored-by: Thibaut Girka <thib@sitedethib.com>

* Use preview card blurhash in WebUI

* Handle sensitive preview cards

Fixes #13001

* Display appropriate error when performing unpermitted operation on custom emoji

Fixes #13897

* Remove links to custom emoji actions not performable by moderators

* Fix serialization of replies when some of them are URIs

Fixes #13956

* Add test

And add `created_at` to encrypted message serializer

Fixes #13949

* Fix admin page crashing when trying to block an invalid domain name

Fixes #13880

* Fix trailing and leading spaces not being properly stripped for domain blocks

Unfortunately, Firefox does not support the `keepalive` parameter
I used in the previous PR. However it supports the `navigator.sendBeacon`
API that allows that kind of things, but does not allow setting headers.

Therefore, this PR replaces it with a `sendBeacon` call that passes the
bearer token in the POST data.

Doorkeeper will then handle the auth token out of the box, as long as
it is passed as form data. Passing the query as JSON does not work.

* Periodically save timeline markers

This saves timeline markers immediately upon message arrival, but not more
than once every 5 minutes.

This does not change how the markers are saved on closing the window,
except that it avoids submitting them if there is no need for it.

* Use the Fetch API when possible instead of XHR on window unload