cyrpto: Go into passive mode if someone else replies to a request

matrix_sdk_crypto/src/verification/requests.rs

@@ -305,7 +305,11 @@ impl VerificationRequest {
         let mut inner = self.inner.lock().unwrap();
 
         if let InnerRequest::Created(s) = &*inner {
-            *inner = InnerRequest::Ready(s.clone().into_ready(sender, content));
+            if sender == self.own_user_id() && content.from_device() == self.account.device_id() {
+                *inner = InnerRequest::Passive(s.clone().into_passive(content))
+            } else {
+                *inner = InnerRequest::Ready(s.clone().into_ready(sender, content));
+            }
         }
     }
 
@@ -515,6 +519,18 @@ impl RequestState<Created> {
         }
     }
 
+    fn into_passive(self, content: &ReadyContent) -> RequestState<Passive> {
+        RequestState {
+            account: self.account,
+            flow_id: self.flow_id,
+            verification_cache: self.verification_cache,
+            private_cross_signing_identity: self.private_cross_signing_identity,
+            store: self.store,
+            other_user_id: self.other_user_id,
+            state: Passive { other_device_id: content.from_device().to_owned() },
+        }
+    }
+
     fn into_ready(self, _sender: &UserId, content: &ReadyContent) -> RequestState<Ready> {
         // TODO check the flow id, and that the methods match what we suggested.
         RequestState {