fix: Update chats.update_last_messages trigger to make sure it is only called for actual last message in case of update

[lazy-geek]

What does it do?

update the rooms.lastMessages when the actual last message of room is updated and not any other message

Why is it needed?

it can be the case that a message got updated that is not actually the last message, in that case the rooms.lastMessages should not be updated. this pr fixes that

you can see here in example app we update message status

onMessageVisibilityChanged: (message, visible) async {
                if (message.status != types.Status.seen &&
                    message.author.id !=
                        SupabaseChatCore.instance.loggedSupabaseUser!.id) {
                  await SupabaseChatCore.instance.updateMessage(
                    message.copyWith(status: types.Status.seen),
                    widget.room.id,
                  );
                }
              },

but we do it for multiple messages and it is not necessarily that the last message in room will be updated last which can cause rooms.lastMessages to be updated with some other message

How to test it?

you can test it after running the migration and running the example project that the issue i described is fixed by this change