* Use ActiveRecord::Result#to_ary instead of deprecated to_hash

They do the same thing, and to_hash has been removed from Rails 6.1

* Explicitly name polymorphic indexes to workaround a bug in Rails 6.1

cf. https://github.com/rails/rails/issues/41693

* Fix incorrect usage of “foreign_key” in migration script

* Use `ActiveModel::Errors#delete` instead of deprecated clear method

* Fix link headers tests on Rails 6.1

Rails 6.1 adds values to the Link header by default, thus it is not a
LinkHeader object anymore. Fix the test to parse the Link header instead
of assuming it is a LinkHeader.

Fixes #15133

* Prepare Mastodon for zeitwerk autoloader (Rails 6)

Add inflections and rename/move a few classes.

In particular, app/lib/exceptions.rb and app/lib/sanitize_config.rb
were manually loaded while still in autoload paths.

* Add inflection for Url → URL

* Fix cache_collection crashing when given an empty collection

* Add tests

* Fix misuse of foreign_type

* Fix use of removed "add_template_helper"

* Use response.media_type instead of response.content_type in tests

* Fix CSV export controller test on Rails 6

Rails 6 sets a "filename*" field in the Content-Disposition header to
explicitly encode the filename as UTF-8.

This changes checks the first part of the Content-Disposition header so
it matches in both Rails 5 and Rails 6.

* Fix emoji formatting with Rails 6

* Make emoji output more idiomatic and robust

* Switch from redis-rails gem to built-in Rails redis cache storage

Remove locks from scheduled jobs

The exports page showed a different "CSV" capitalisation in the
"Bookmarks" row ("Csv") compared to the other rows ("CSV").
This was due to a referece to a translation string that does not exist,
`bookmarks.csv`, defaulting to the key's last segment in title case.

This issue was introduced in commit dcd86204 (PR #14956).

(h/t @meqif for helping with figuring out the bug)

Fixes #15849

* Add tests

* Fix URL scanning in note length validator and preview card fetching

* Update twitter-text from 1.14 to 3.1.0

* Disable emoji parsing

* Properly depend on twitter-text for url detection

* Fix some URLs being wrongly detected client-side

* Add test for server-side validation of non-autolinkable URLs

* Fix server-side status length counting

Only available to the application the user originally signed-up with

Fixes #14910

* Fix crash on receiving requests with missing Digest header

Return an error pointing out that Digest is missing, instead of crashing.

Fixes #15743

* Fix from review feedback

* Change ResolveAccountService's handling of skip_webfinger

Change it so it never makes any webfinger query, as the name would imply.

* Add tests

* Change FollowService to not take an URI for target_account

* Restore domain-block check in FollowService

* Fix tests

The "ends_with?" method is just a Rails alias of Ruby's "end_with?" method.
Using the latter makes the code less brittle.

* Fixed picture in picture compatibility error in WebUI when status is deleted

* Revert "Fixed picture in picture compatibility error in WebUI when status is deleted"

This reverts commit f003b7d9d88688e9504f7dfae1545d7522fcfd98.

* Close the modal display of the image when status is deleted

* Fixed the case statement before the default statement

* Removed unnecessary parts

* Enable secure cookie flag for https only

* Disable force_ssl for .onion hosts only

Co-authored-by: Aiden McClelland <me@drbonez.dev>

* Use custom mascot on static share page

* Use full_asset_url

* Fix URI of repeat follow requests not being recorded

In case we receive a “repeat” or “duplicate” follow request, we automatically
fast-forward the accept with the latest received Activity `id`, but we don't
record it.

In general, a “repeat” or “duplicate” follow request may happen if for some
reason (e.g. inconsistent handling of Block or Undo Accept activities, an
instance being brought back up from the dead, etc.) the local instance thought
the remote actor were following them while the remote actor thought otherwise.

In those cases, the remote instance does not know about the older Follow
activity `id`, so keeping that record serves no purpose, but knowing the most
recent one is useful if the remote implementation at some point refers to it
by `id` without inlining it.

* Add tests

* Slightly reorder three dots menu on toots to make it more intuitive

- Make “Pin to profile” always appear at the same place
- Add separator to group “Bookmark” and “Pin to profile”
- Fix separator being the first item in some cases

* Fix missing semicolon and keep status_action_bar.js and action_bar.js in sync

* Various dropdown code quality fixes

* Prepare support for privacy selection in boost modal

* Add dropdown for boost privacy in boost confirmation modal

An uncommon but somewhat difficult to digagnose issue is dealing with
improperly-seeded databases. In such cases, instance-signed fetches will
fail with a ActiveRecord::RecordNotFound error, usually caught and handled
as generic 404, leading people to think the remote resource itself has not
been found, while it's the local instance actor that does not exist.

This commit changes the code so that failure to find the instance actor
automatically creates a new one, so that improperly-seeded databases do
not cause any issue.

* Change max. image size to 1920x1080px

* Change it in web UI too

* Atomically check for processing lock in Move handler

* Prevent race condition when creating account migrations

Fixes #15595

* Add tests

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

Co-authored-by: Claire <claire.github-309c@sitedethib.com>

* Improved performance of notification preloading

* Remove Cacheable from Notification

* Fix test