Add setting to not aggregate reblogs (#9248)

* Add setting to not aggregate reblogs

Fixes #9222

* Handle cases where user is nil in add_to_home and add_to_list

* Add hint for setting_aggregate_reblogs option

* Reword setting_aggregate_reblogs label

config/locales/simple_form.en.yml

@@ -19,6 +19,7 @@ en:
         password: Use at least 8 characters
         phrase: Will be matched regardless of casing in text or content warning of a toot
         scopes: Which APIs the application will be allowed to access. If you select a top-level scope, you don't need to select individual ones.
+        setting_aggregate_reblogs: Do not show new boosts for toots that have been recently boosted (only affects newly-received boosts)
         setting_default_language: The language of your toots can be detected automatically, but it's not always accurate
         setting_display_media_default: Hide media marked as sensitive
         setting_display_media_hide_all: Always hide all media
@@ -65,6 +66,7 @@ en:
         otp_attempt: Two-factor code
         password: Password
         phrase: Keyword or phrase
+        setting_aggregate_reblogs: Group boosts in timelines
         setting_auto_play_gif: Auto-play animated GIFs
         setting_boost_modal: Show confirmation dialog before boosting
         setting_default_language: Posting language

config/settings.yml

@@ -33,6 +33,7 @@ defaults: &defaults
   system_font_ui: false
   noindex: false
   theme: 'default'
+  aggregate_reblogs: true
   notification_emails:
     follow: false
     reblog: false