Bug fix and minor improvements

Bug fixes:
- Do not send typing notice and set room read
  markers when the account is invisible
- Fix typing on set_presence
- Allow users to unset status message by setting
  it to blank
- Escape html tags of status message on
  SubtitleLabel of MemberDelegate

Improvements:
- Display user ID and status message on a tooltip
  by hovering account or room member name

src/backend/backend.py

@@ -317,7 +317,8 @@ class Backend:
         """
 
         async def update(client: MatrixClient) -> None:
-            room = self.models[client.user_id, "rooms"].get(room_id)
+            room    = self.models[client.user_id, "rooms"].get(room_id)
+            account = self.models["accounts"][client.user_id]
 
             if room:
                 room.set_fields(
@@ -327,7 +328,10 @@ class Backend:
                     local_highlights = False,
                 )
                 await client.update_account_unread_counts()
-                await client.update_receipt_marker(room_id, event_id)
+
+                # Only update server markers if the account is not invisible
+                if account.presence != Presence.State.invisible:
+                    await client.update_receipt_marker(room_id, event_id)
 
         await asyncio.gather(*[update(c) for c in self.clients.values()])
 

src/backend/matrix_client.py

@@ -1064,6 +1064,17 @@ class MatrixClient(nio.AsyncClient):
         ])
 
 
+    async def room_typing(
+        self, room_id: str, typing_state: bool = True, timeout: int = 5000,
+    ):
+        """Set typing notice to the server."""
+
+        # Do not send typing notice if the user is invisible
+        if self.models["accounts"][self.user_id].presence != \
+                Presence.State.invisible:
+            await super().room_typing(room_id, typing_state, timeout)
+
+
     async def get_redacted_event_content(
         self,
         nio_type: Type[nio.Event],
@@ -1222,11 +1233,11 @@ class MatrixClient(nio.AsyncClient):
 
 
     async def set_presence(
-        self, presence: str, status_msg: str = None,
+        self, presence: str, status_msg: Optional[str] = None,
     ) -> None:
         """Set presence state for this account."""
 
-        status_msg = status_msg or (
+        status_msg = status_msg if status_msg is not None else (
             self.models["accounts"][self.user_id].status_msg
         )