Same as #8220 but for reports

* Never return empty participants for conversations

Fixes #10068

* Fix client-side crash when conversations have no participants

Since the “domain” field is ignored in this case.

Regression from #9581

Fix #8785

Fix #9350

Fix #6060

Fix #9922

Fix #9190

fix #10045

* Add image descriptions to searchable post content.

* Allow multi-line image descriptions.

* Request image descriptions in the same query as posts when creating the search index.

(see https://github.com/tootsuite/mastodon/pull/10036#discussion_r256551624)

* Revert "Change robots.txt to exclude some URLs (#10037)"

This reverts commit 80161f43.

* Let's block media_proxy

/media_proxy/ is a dynamic route used for requesting uncached media, so it's
probably bad to let crawlers use it

* misleading comment

- Exclude static assets
- Exclude uploaded files
- Exclude alternate versions of the profile page
- Exclude media proxy URLs

Fix #10033

Regression from #9998

* Filter incoming Announce activities by relation to local activity

Reject if announcer is not followed by local accounts, and is not
from an enabled relay, and the object is not a local status

Follow-up to #10005

* Fix tests

Reject those from accounts with no local followers, from relays
that are not enabled, which do not address local accounts and are
not replies to accounts that do have local followers

* When self-boosting, embed original toot into Announce serialization

* Process unknown self-boosts from Announce object if it is more than an URI

* Add some self-boost specs

* Only serialize private toots in self-Announces

* Create Redisable

* Use #redis instead of Redis.current

Fix #9895

Deletions take a lot of resources to execute and cause a lot of
federation traffic, so it makes sense to decrease the number
someone can queue up through the API.

30 per 30 minutes

Fixes #9995

* Add support for IPv6 only MXes

* Fixed email validator tests

* Avoid two-step rendering of statuses as much as possible

Cache width shared by Video player, MediaGallery and Cards at the
ScrollableList level, pass it down through StatusList and Notifications.

* Adjust scroll when new preview cards appear

* Adjust scroll when statuses above the current scroll position are deleted

IntersectionObserverArticle is made to save on RAM by avoiding fully rendering
items that are far out of view. However, it did not work for items spawned
outside the intersection observer.