Fix displayname not updating for some users

Users who the bridge only saw via logged in users with the target user
in their contact lists wouldn't get their displayname updated due to an
invalid condition in the update_displayname function.

mautrix_telegram/portal.py

@@ -1774,7 +1774,7 @@ class Portal:
                 return
 
         if sender and not sender.displayname:
-            self.log.debug(f"Telegram user {sender.tgid} sent a message, but doesn't have a"
+            self.log.debug(f"Telegram user {sender.tgid} sent a message, but doesn't have a "
                            "displayname, updating info...")
             entity = await source.client.get_entity(PeerUser(sender.tgid))
             await sender.update_info(source, entity)

mautrix_telegram/puppet.py

@@ -363,11 +363,13 @@ class Puppet:
                                  ) -> bool:
         if self.disable_updates:
             return False
-        is_main_source = (source.is_relaybot or (self.displayname_source is not None
-                                                 and self.displayname_source == source.tgid))
-        # No phone -> not in contact list -> can't set custom name -> name is trustworthy
-        is_trustworthy_source = isinstance(info, User) and info.phone is None
-        if not is_main_source and not is_trustworthy_source:
+        allow_source = (source.is_relaybot
+                        or self.displayname_source == source.tgid
+                        # No displayname source, so just trust anything
+                        or self.displayname_source is None
+                        # No phone -> not in contact list -> can't set custom name
+                        or (isinstance(info, User) and info.phone is None))
+        if not allow_source:
             return False
         elif isinstance(info, UpdateUserName):
             info = await source.client.get_entity(PeerUser(self.tgid))