Prevent crash in loading past evnts

TODO.md

@@ -2,6 +2,9 @@
 
 ## Media
 
+- Send the monitor PR
+- Pause tests
+
 - Handle set avatar upload errors
 - Support encrypted m.file
 - Confirmation box after picking file to upload
@@ -38,8 +41,15 @@
 
 ## Bug fixes
 
+- two upload delegates height bug
+- Leave box button focus
+- Pause upload, switch to other room, then come back, wrong state displayed
+- Adding an account with no rooms
+- Join button 502
 - Retry the initial profile retrieval if it fails (due to e.g. dead server)
-- Pausing uploads doesn't work well with matrix.org
+
+- Messed up message delegates position
+- Pausing uploads doesn't work well, servers end up dropping the connection 
 - Quickly posting with another account leads to sync stop
 - CPU usage
 - `code` not colored in room subtitle
@@ -64,6 +74,8 @@
 
 ## Interface
 
+- https://doc.qt.io/qt-5/qml-qtquick-smoothedanimation.html for progress bars
+- 
 - Make all "Cancel" buttons able to cancel running Backend coroutines set
   `disabledWhileLoading` to `false` for all "OK" buttons where it makes sense
 - Use a loader of the swipeview containing members, settings, etc views

src/python/matrix_client.py

@@ -459,6 +459,10 @@ class MatrixClient(nio.AsyncClient):
 
         await self.first_sync_done.wait()
 
+        while not self.past_tokens.get(room_id):
+            # If a new room was added, wait for onSyncResponse to set the token
+            await asyncio.sleep(0.1)
+
         response = await self.room_messages(
             room_id = room_id,
             start   = self.past_tokens[room_id],

src/python/nio_callbacks.py

@@ -272,6 +272,7 @@ class NioCallbacks:
 
         if type_and_content is not None:
             type_specifier, content = type_and_content
+
             await self.client.register_nio_event(
                 room, ev, content=content, type_specifier=type_specifier,
             )