Select alias when multiple matching identities

app/src/main/java/eu/faircode/email/DaoIdentity.java

@@ -49,24 +49,23 @@ public interface DaoIdentity {
             " ORDER BY name COLLATE NOCASE")
     List<EntityIdentity> getIdentities(long account);
 
+    @Query("SELECT * FROM identity" +
+            " WHERE account = :account" +
+            " AND email = :email COLLATE NOCASE")
+    List<EntityIdentity> getIdentities(long account, String email);
+
     @Query("SELECT identity.* FROM identity" +
             " JOIN account ON account.id = identity.account" +
             " WHERE identity.account = :account" +
             " AND identity.synchronize AND account.synchronize")
     List<EntityIdentity> getSynchronizingIdentities(long account);
 
-    @Query("SELECT * FROM identity WHERE id = :id")
-    EntityIdentity getIdentity(long id);
-
-    @Query("SELECT * FROM identity" +
-            " WHERE account = :account AND email = :email COLLATE NOCASE" +
-            " ORDER BY CASE WHEN synchronize THEN 0 ELSE 1 END" +
-            " LIMIT 1")
-    EntityIdentity getIdentity(long account, String email);
-
     @Query("SELECT COUNT(*) FROM identity WHERE synchronize")
     int getSynchronizingIdentityCount();
 
+    @Query("SELECT * FROM identity WHERE id = :id")
+    EntityIdentity getIdentity(long id);
+
     @Insert
     long insertIdentity(EntityIdentity identity);
 

app/src/main/java/eu/faircode/email/FragmentMessages.java

@@ -3915,7 +3915,15 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                     if (message == null || message.identity == null)
                         return null;
 
-                    return db.identity().getIdentity(message.identity);
+                    EntityIdentity identity = db.identity().getIdentity(message.identity);
+                    if (identity == null)
+                        return null;
+
+                    List<EntityIdentity> duplicates = db.identity().getIdentities(identity.account, identity.email);
+                    if (duplicates == null || duplicates.size() > 1)
+                        return null;
+
+                    return identity;
                 }
 
                 @Override