Merge commit '0ad2413b35287958f59073a5b63aecc659a64d98' into glitch-soc/merge-upstream

Conflicts:
- `app/javascript/styles/mastodon/forms.scss`:
  Conflict because we ran eslint autofix on upstream files.
- `config/initializers/content_security_policy.rb`:
  Code style changes but we have a different version.
  Kept our version.
- `streaming/index.js`:
  Upstream fixed a typo close to glitch-soc-only code.
  Applied upstream's changes.

app/helpers/application_helper.rb

@@ -118,7 +118,7 @@ module ApplicationHelper
   end
 
   def check_icon
-    content_tag(:svg, tag(:path, 'fill-rule': 'evenodd', 'clip-rule': 'evenodd', d: 'M16.704 4.153a.75.75 0 01.143 1.052l-8 10.5a.75.75 0 01-1.127.075l-4.5-4.5a.75.75 0 011.06-1.06l3.894 3.893 7.48-9.817a.75.75 0 011.05-.143z'), xmlns: 'http://www.w3.org/2000/svg', viewBox: '0 0 20 20', fill: 'currentColor')
+    content_tag(:svg, tag.path('fill-rule': 'evenodd', 'clip-rule': 'evenodd', d: 'M16.704 4.153a.75.75 0 01.143 1.052l-8 10.5a.75.75 0 01-1.127.075l-4.5-4.5a.75.75 0 011.06-1.06l3.894 3.893 7.48-9.817a.75.75 0 011.05-.143z'), xmlns: 'http://www.w3.org/2000/svg', viewBox: '0 0 20 20', fill: 'currentColor')
   end
 
   def visibility_icon(status)
@@ -152,7 +152,7 @@ module ApplicationHelper
   end
 
   def opengraph(property, content)
-    tag(:meta, content: content, property: property)
+    tag.meta(content: content, property: property)
   end
 
   def body_classes
@@ -162,7 +162,7 @@ module ApplicationHelper
     output << 'system-font' if current_account&.user&.setting_system_font_ui
     output << (current_account&.user&.setting_reduce_motion ? 'reduce-motion' : 'no-reduce-motion')
     output << 'rtl' if locale_direction == 'rtl'
-    output.reject(&:blank?).join(' ')
+    output.compact_blank.join(' ')
   end
 
   def cdn_host