Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- .eslintrc.yml
  Removed, as upstream removed it.
- app/controllers/admin/statuses_controller.rb
  Minor code cleanup when porting one of our features.
- app/models/account.rb
  Note length validation has changed upstream.
  We now use upstream's validation (dropped legacy glitch-soc
  account metadata stuff) but with configurable limit.
- app/services/post_status_service.rb
  Upstream has added support for scheduled toots, refactoring
  the code a bit. Adapted our changes to this refactoring.
- app/views/stream_entries/_detailed_status.html.haml
  Not a real conflict, changes too close.
- app/views/stream_entries/_simple_status.html.haml
  Not a real conflict, changes too close.

db/migrate/20181207011115_downcase_custom_emoji_domains.rb

@@ -1,7 +1,15 @@
 class DowncaseCustomEmojiDomains < ActiveRecord::Migration[5.2]
   disable_ddl_transaction!
 
-  def change
+  def up
+    duplicates = CustomEmoji.connection.select_all('SELECT string_agg(id::text, \',\') AS ids FROM custom_emojis GROUP BY shortcode, lower(domain) HAVING count(*) > 1').to_hash
+
+    duplicates.each do |row|
+      CustomEmoji.where(id: row['ids'].split(',')[0...-1]).destroy_all
+    end
+
     CustomEmoji.in_batches.update_all('domain = lower(domain)')
   end
+
+  def down; end
 end

db/migrate/20190103124649_create_scheduled_statuses.rb

@@ -0,0 +1,9 @@
+class CreateScheduledStatuses < ActiveRecord::Migration[5.2]
+  def change
+    create_table :scheduled_statuses do |t|
+      t.belongs_to :account, foreign_key: { on_delete: :cascade }
+      t.datetime :scheduled_at, index: true
+      t.jsonb :params
+    end
+  end
+end

db/migrate/20190103124754_add_scheduled_status_id_to_media_attachments.rb

@@ -0,0 +1,8 @@
+class AddScheduledStatusIdToMediaAttachments < ActiveRecord::Migration[5.2]
+  disable_ddl_transaction!
+
+  def change
+    add_reference :media_attachments, :scheduled_status, foreign_key: { on_delete: :nullify }, index: false
+    add_index :media_attachments, :scheduled_status_id, algorithm: :concurrently
+  end
+end