Fix subscriptions:clear task, refactor feeds, refactor streamable activites

and atom feed generation to some extent, as well as the way mentions are
stored

app/helpers/application_helper.rb

@@ -20,13 +20,25 @@ module ApplicationHelper
     end
   end
 
-  def linkify(status)
-    mention_hash = {}
-    status.mentions.each { |m| mention_hash[m.acct] = m }
-    coder = HTMLEntities.new
+  def account_from_mentions(search_string, mentions)
+    mentions.each { |x| return x.account if x.account.acct.eql?(search_string) }
 
-    auto_link(coder.encode(status.text), link: :urls, html: { rel: 'nofollow noopener' }).gsub(Account::MENTION_RE) do |m|
-      account = mention_hash[Account::MENTION_RE.match(m)[1]]
+    # If that was unsuccessful, try fetching user from db separately
+    # But this shouldn't ever happen if the mentions were created correctly!
+    username, domain = search_string.split('@')
+
+    if domain == Rails.configuration.x.local_domain
+      account = Account.find_local(username)
+    else
+      account = Account.find_by(username: username, domain: domain)
+    end
+
+    account
+  end
+
+  def linkify(status)
+    auto_link(HTMLEntities.new.encode(status.text), link: :urls, html: { rel: 'nofollow noopener' }).gsub(Account::MENTION_RE) do |m|
+      account = account_from_mentions(Account::MENTION_RE.match(m)[1], status.mentions)
       "#{m.split('@').first}<a href=\"#{url_for_target(account)}\" class=\"mention\">@<span>#{account.acct}</span></a>"
     end.html_safe
   end