Use new nio server-backed room unread counts

TODO.md

@@ -15,6 +15,9 @@
 
 ## Issues
 
+- Don't send typing notification when switching to a room where the composer 
+  has loaded text 
+
 - SSL error on python 3.7
 
 - Jumping between accounts (clicking in account bar or alt+(Shift+)N) is

src/backend/matrix_client.py

@@ -1259,13 +1259,9 @@ class MatrixClient(nio.AsyncClient):
             registered      = None
             last_event_date = datetime.fromtimestamp(0)
             typing_members  = []
-            mentions        = 0
-            unreads         = 0
         else:
             last_event_date = registered.last_event_date
             typing_members  = registered.typing_members
-            mentions        = registered.mentions
-            unreads         = registered.unreads
 
         room_item = Room(
             id             = room.room_id,
@@ -1301,8 +1297,9 @@ class MatrixClient(nio.AsyncClient):
             can_set_guest_access = can_send_state("m.room.guest_access"),
 
             last_event_date = last_event_date,
-            mentions        = mentions,
-            unreads         = unreads,
+
+            mentions = room.unread_highlights,
+            unreads  = room.unread_notifications,
         )
 
         self.models[self.user_id, "rooms"][room.room_id] = room_item
@@ -1472,16 +1469,3 @@ class MatrixClient(nio.AsyncClient):
             return
 
         AlertRequested()
-
-        if self.open_room != room.room_id:
-            account = self.models["accounts"][self.user_id]
-            room    = self.models[self.user_id, "rooms"][room.room_id]
-
-            account.total_unread += 1
-            room.unreads         += 1
-
-            content = fields.get("content", "")
-
-            if HTML.user_id_link_in_html(content, self.user_id):
-                account.total_mentions += 1
-                room.mentions          += 1