update thread cache when receiving a new identity

src/org/smssecure/smssecure/database/Database.java

@@ -40,7 +40,7 @@ public abstract class Database {
       notifyConversationListeners(threadId);
   }
 
-  protected void notifyConversationListeners(long threadId) {
+  public void notifyConversationListeners(long threadId) {
     context.getContentResolver().notifyChange(DatabaseContentProviders.Conversation.getUriForThread(threadId), null);
   }
 

src/org/smssecure/smssecure/jobs/SmsDecryptJob.java

@@ -203,7 +203,8 @@ public class SmsDecryptJob extends MasterSecretJob {
       Recipients recipients  = RecipientFactory.getRecipientsFromString(context, message.getSender(), false);
       long       recipientId = recipients.getPrimaryRecipient().getRecipientId();
 
-      database.addMismatchedIdentity(messageId, recipientId, e.getUntrustedIdentity());
+      database.notifyConversationListeners(threadId);
+      database.setMismatchedIdentity(messageId, recipientId, e.getUntrustedIdentity());
     }
   }