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.

spec/helpers/jsonld_helper_spec.rb

@@ -22,11 +22,35 @@ describe JsonLdHelper do
   end
 
   describe '#first_of_value' do
-    pending
+    context 'value.is_a?(Array)' do
+      it 'returns value.first' do
+        value = ['a']
+        expect(helper.first_of_value(value)).to be 'a'
+      end
+    end
+
+    context '!value.is_a?(Array)' do
+      it 'returns value' do
+        value = 'a'
+        expect(helper.first_of_value(value)).to be 'a'
+      end
+    end
   end
 
   describe '#supported_context?' do
-    pending
+    context "!json.nil? && equals_or_includes?(json['@context'], ActivityPub::TagManager::CONTEXT)" do
+      it 'returns true' do
+        json = { '@context' => ActivityPub::TagManager::CONTEXT }.as_json
+        expect(helper.supported_context?(json)).to be true
+      end
+    end
+
+    context 'else' do
+      it 'returns false' do
+        json = nil
+        expect(helper.supported_context?(json)).to be false
+      end
+    end
   end
 
   describe '#fetch_resource' do