Sort outgoing messages on recipient

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

@@ -874,8 +874,7 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             boolean outbox = EntityFolder.OUTBOX.equals(message.folderType);
             boolean outgoing = isOutgoing(message);
             boolean reverse = (outgoing &&
-                    (viewType != ViewType.THREAD || !threading) &&
-                    !show_recipients && !"sender".equals(sort));
+                    (viewType != ViewType.THREAD || !threading) && !show_recipients);
             Address[] senders = ContactInfo.fillIn(reverse ? message.to : message.senders, prefer_contact);
             Address[] recipients = ContactInfo.fillIn(reverse ? message.from : message.recipients, prefer_contact);
             boolean authenticated =

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

@@ -2716,7 +2716,7 @@ class Core {
             EntityIdentity identity = matchIdentity(context, folder, message);
             message.identity = (identity == null ? null : identity.id);
 
-            message.sender = MessageHelper.getSortKey(message.from);
+            message.sender = MessageHelper.getSortKey(EntityFolder.isOutgoing(folder.type) ? message.to : message.from);
             Uri lookupUri = ContactInfo.getLookupUri(message.from);
             message.avatar = (lookupUri == null ? null : lookupUri.toString());
             if (message.avatar == null && notify_known && pro)