Update bankruptcy unread count to not include muted topics or read messages.

This should address user reports of huge bankruptcy counts even when
they are relatively caught up. The root issue is that we sometimes
don't mark messages as read for some reason.

(imported from commit 8799305a8665f9ee239575e6e95f603f89c1d427)

zerver/views/__init__.py

@@ -625,12 +625,19 @@ def approximate_unread_count(user_profile):
                                        Subscription.objects.filter(
             user_profile=user_profile, in_home_view=False)]
 
-    # Don't include messages that aren't in your home view, as they might never
-    # be read.
+    muted_topics = ujson.loads(user_profile.muted_topics)
+    # If muted_topics is empty, it looks like []. If it is non-empty, it look
+    # like [[u'devel', u'test']]. We should switch to a consistent envelope, but
+    # until we do we still have both in the database.
+    if muted_topics:
+        muted_topics = muted_topics[0]
+
     return UserMessage.objects.filter(
         user_profile=user_profile, message_id__gt=user_profile.pointer).exclude(
         message__recipient__type=Recipient.STREAM,
-        message__recipient__id__in=not_in_home_view_recipients).count()
+        message__recipient__id__in=not_in_home_view_recipients).exclude(
+        message__subject__in=muted_topics).exclude(
+        flags=UserMessage.flags.read).count()
 
 def sent_time_in_epoch_seconds(user_message):
     # user_message is a UserMessage object.