Resolve #9490

* Always use the scrollable class for the ScrollList component

Fixes #9499 as well as empty timelines' scrollbar “blinking”
between loading state and empty state.

* Do not display empty message when the list is known to have more elements

Fixes #9500

* Fix LoadMore usage in account media gallery

(Even though that codepath is probably never actually used…)

* Make account media gallery more consistent with account timeline

Fixes #9498

Display “load more” more consistently, add a loading indicator on first load.

* Fix “load more” button when no data has been fetched

Define `Settings::BaseController#set_body_classes` so that sub classes
inherit `Settings::BaseController` don't need to define
`#set_body_classes` agein.

* Fix markup in admin/accounts/:id table for avatar

* Add admin ability to remove an user's header image

* Add instance-wide setting to disable profile directory

Fixes #9496

When the profile directory is disabled:
- The “discoverable” setting is hidden from users
- The “profile directory” link is not shown on public pages
- /explore returns 404

* Move Setting.profile_directory check to a before_action filter

Bumps [letter_opener](https://github.com/ryanb/letter_opener) from 1.6.0 to 1.7.0.
- [Release notes](https://github.com/ryanb/letter_opener/releases)
- [Changelog](https://github.com/ryanb/letter_opener/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ryanb/letter_opener/compare/v1.6.0...v1.7.0

)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [json-ld-preloaded](https://github.com/ruby-rdf/json-ld-preloaded) from 2.2.3 to 3.0.0.
- [Release notes](https://github.com/ruby-rdf/json-ld-preloaded/releases)
- [Commits](https://github.com/ruby-rdf/json-ld-preloaded/compare/2.2.3...3.0.0

)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* Adds the Profil directory

* Adds the line about directory

* Harmonisation

* Update oc.yml

* i18n-tasks normalize && i18n-tasks remove-unused

* yarn manage:translations

* Make custom emoji domains case sensitive #9351

* Fixup style in downcase_domain to comply with codeclimate.

* switch if! to unless

* Don't use transactions, operate in batches.

Also revert spurious schema change.

Fixes #8189

rack-cors being called before the application router, it does not follow
the redirection, and we need a separate rule for /users/:username.

* Add specs for ActivityPub::CollectionsController#show

* Raise ActiveRecord::RecordNotFound

Raising ActiveRecord::NotFound raises NameError: uninitialized constant
ActiveRecord::NotFound.

* Add setting to not aggregate reblogs

Fixes #9222

* Handle cases where user is nil in add_to_home and add_to_list

* Add hint for setting_aggregate_reblogs option

* Reword setting_aggregate_reblogs label

Signed-off-by: Marcin Mikołajczak <me@m4sk.in>

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.61.0 to 0.61.1.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop/compare/v0.61.0...v0.61.1

)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* fix non-escaped html in the profile settings

* provide a default profile text in case if there's no custom one

* update haml syntax

* simplify default profile name to username

* sanitize user-input html but display emojified icons

Since dots are not allowed in username,
this spec is no longer needed.

* Fix missing variable in directory page title

* Order hashtags by number of people instead of alphabetically

* Add icon to OpenGraph preview of directory page

* Prevent line breaks in hashtags and ensure lowercase in the table

Fix #5578

`#from_account` isn't defined.

Bumps [rails](https://github.com/rails/rails) from 5.2.1.1 to 5.2.2.
- [Release notes](https://github.com/rails/rails/releases)
- [Commits](https://github.com/rails/rails/compare/v5.2.1.1...v5.2.2

)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [rails-controller-testing](https://github.com/rails/rails-controller-testing) from 1.0.3 to 1.0.4.
- [Release notes](https://github.com/rails/rails-controller-testing/releases)
- [Commits](https://github.com/rails/rails-controller-testing/compare/v1.0.3...v1.0.4

)

Signed-off-by: dependabot[bot] <support@dependabot.com>

Bumps [rubocop](https://github.com/rubocop-hq/rubocop) from 0.60.0 to 0.61.0.
- [Release notes](https://github.com/rubocop-hq/rubocop/releases)
- [Changelog](https://github.com/rubocop-hq/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop-hq/rubocop/compare/v0.60.0...v0.61.0

)

Signed-off-by: dependabot[bot] <support@dependabot.com>

* Use `update_column` instead of `update_attribute` in callback

`update_attribute` would normally cause callbacks to be called.
Called from a callback, it seems to stop further callbacks from executing.

`update_column` does the same work, but without calling callbacks or
preventing other callbacks from executing.

* Fix deadlocks by moving account stats update outside transaction