Prevent Droste effect

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

@@ -2841,7 +2841,6 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
 
                     boolean auto_decrypt = prefs.getBoolean("auto_decrypt", false);
                     if (auto_decrypt &&
-                            message.revision == null && // Prevent Droste effect
                             (EntityMessage.PGP_SIGNENCRYPT.equals(message.encrypt) ||
                                     EntityMessage.SMIME_SIGNENCRYPT.equals(message.encrypt)))
                         onActionDecrypt(message, true);

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

@@ -7156,6 +7156,9 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                 if (attachments == null)
                     return null;
 
+                if (auto && message.revision != null)
+                    return null;
+
                 InputStream in = null;
                 OutputStream out = null;
                 boolean inline = false;