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

Conflicts:
- `README.md`:
  Upstream added a link to the roadmap, but we have a completely different README.
  Kept ours.
- `app/models/media_attachment.rb`:
  Upstream upped media attachment limits.
  Updated the default according to upstream's.
- `db/migrate/20180831171112_create_bookmarks.rb`:
  Upstream changed the migration compatibility level.
  Did so too.
- `config/initializers/content_security_policy.rb`:
  Upstream refactored this file but we have a different version.
  Kept our version.
- `app/controllers/settings/preferences_controller.rb`:
  Upstream completely refactored user settings storage, and glitch-soc has a
  different set of settings.
  The file does not directly references individual settings anymore.
  Applied upstream changes.
- `app/lib/user_settings_decorator.rb`:
  Upstream completely refactored user settings storage, and glitch-soc has a
  different set of settings.
  The file got removed entirely.
  Removed it as well.
- `app/models/user.rb`:
  Upstream completely refactored user settings storage, and glitch-soc has a
  different set of settings.
  References to individual settings have been removed from the file.
  Removed them as well.
- `app/views/settings/preferences/appearance/show.html.haml`:
  Upstream completely refactored user settings storage, and glitch-soc has a
  different set of settings.
  Applied upstream's changes and ported ours back.
- `app/views/settings/preferences/notifications/show.html.haml`:
  Upstream completely refactored user settings storage, and glitch-soc has a
  different set of settings.
  Applied upstream's changes and ported ours back.
- `app/views/settings/preferences/other/show.html.haml`:
  Upstream completely refactored user settings storage, and glitch-soc has a
  different set of settings.
  Applied upstream's changes and ported ours back.
- `config/settings.yml`:
  Upstream completely refactored user settings storage, and glitch-soc has a
  different set of settings.
  In particular, upstream removed user-specific and unused settings.
  Did the same in glitch-soc.
- `spec/controllers/application_controller_spec.rb`:
  Conflicts due to glitch-soc's theming system.
  Mostly kept our version, as upstream messed up the tests.

app/models/concerns/attachmentable.rb

@@ -5,7 +5,7 @@ require 'mime/types/columnar'
 module Attachmentable
   extend ActiveSupport::Concern
 
-  MAX_MATRIX_LIMIT = 16_777_216 # 4096x4096px or approx. 16MB
+  MAX_MATRIX_LIMIT = 33_177_600 # 7680x4320px or approx. 847MB in RAM
   GIF_MATRIX_LIMIT = 921_600    # 1280x720px
 
   # For some file extensions, there exist different content

app/models/concerns/has_user_settings.rb

@@ -0,0 +1,141 @@
+# frozen_string_literal: true
+
+module HasUserSettings
+  extend ActiveSupport::Concern
+
+  included do
+    serialize :settings, UserSettingsSerializer
+  end
+
+  def settings_attributes=(attributes)
+    settings.update(attributes)
+  end
+
+  def prefers_noindex?
+    settings['noindex']
+  end
+
+  def preferred_posting_language
+    valid_locale_cascade(settings['default_language'], locale, I18n.locale)
+  end
+
+  def setting_auto_play_gif
+    settings['web.auto_play']
+  end
+
+  def setting_default_sensitive
+    settings['default_sensitive']
+  end
+
+  def setting_unfollow_modal
+    settings['web.unfollow_modal']
+  end
+
+  def setting_boost_modal
+    settings['web.reblog_modal']
+  end
+
+  def setting_delete_modal
+    settings['web.delete_modal']
+  end
+
+  def setting_reduce_motion
+    settings['web.reduce_motion']
+  end
+
+  def setting_system_font_ui
+    settings['web.use_system_font']
+  end
+
+  def setting_noindex
+    settings['noindex']
+  end
+
+  def setting_theme
+    settings['theme']
+  end
+
+  def setting_display_media
+    settings['web.display_media']
+  end
+
+  def setting_expand_spoilers
+    settings['web.expand_content_warnings']
+  end
+
+  def setting_default_language
+    settings['default_language']
+  end
+
+  def setting_aggregate_reblogs
+    settings['aggregate_reblogs']
+  end
+
+  def setting_show_application
+    settings['show_application']
+  end
+
+  def setting_advanced_layout
+    settings['web.advanced_layout']
+  end
+
+  def setting_use_blurhash
+    settings['web.use_blurhash']
+  end
+
+  def setting_use_pending_items
+    settings['web.use_pending_items']
+  end
+
+  def setting_trends
+    settings['web.trends']
+  end
+
+  def setting_crop_images
+    settings['web.crop_images']
+  end
+
+  def setting_disable_swiping
+    settings['web.disable_swiping']
+  end
+
+  def setting_always_send_emails
+    settings['always_send_emails']
+  end
+
+  def setting_default_privacy
+    settings['default_privacy'] || (account.locked? ? 'private' : 'public')
+  end
+
+  def allows_report_emails?
+    settings['notification_emails.report']
+  end
+
+  def allows_pending_account_emails?
+    settings['notification_emails.pending_account']
+  end
+
+  def allows_appeal_emails?
+    settings['notification_emails.appeal']
+  end
+
+  def allows_trends_review_emails?
+    settings['notification_emails.trends']
+  end
+
+  def aggregates_reblogs?
+    settings['aggregate_reblogs']
+  end
+
+  def shows_application?
+    settings['show_application']
+  end
+
+  def show_all_media?
+    settings['web.display_media'] == 'show_all'
+  end
+
+  def hide_all_media?
+    settings['web.display_media'] == 'hide_all'
+  end
+end