Message threading fix

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

@@ -44,7 +44,7 @@ public interface DaoMessage {
             " FROM message" +
             " JOIN folder ON folder.id = message.folder" +
             " WHERE (NOT message.ui_hide OR :debug)" +
-            " GROUP BY CASE WHEN message.thread IS NULL THEN message.id ELSE message.thread END" +
+            " GROUP BY CASE WHEN message.thread IS NULL THEN message.id ELSE message.thread END, message.subject" +
             " HAVING SUM(CASE WHEN folder.type = '" + EntityFolder.INBOX + "' THEN 1 ELSE 0 END) > 0" +
             " ORDER BY message.received DESC")
     DataSource.Factory<Integer, TupleMessageEx> pagedUnifiedInbox(boolean debug);
@@ -57,7 +57,7 @@ public interface DaoMessage {
             " FROM message" +
             " JOIN folder ON folder.id = message.folder" +
             " WHERE (NOT message.ui_hide OR :debug)" +
-            " GROUP BY CASE WHEN message.thread IS NULL THEN message.id ELSE message.thread END" +
+            " GROUP BY CASE WHEN message.thread IS NULL THEN message.id ELSE message.thread END, message.subject" +
             " HAVING SUM(CASE WHEN folder.id = :folder THEN 1 ELSE 0 END) > 0" +
             " ORDER BY message.received DESC, message.sent DESC")
     DataSource.Factory<Integer, TupleMessageEx> pagedFolder(long folder, boolean debug);

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

@@ -542,6 +542,7 @@ public class FragmentCompose extends FragmentEx {
                     draft = new EntityMessage();
                     draft.account = account;
                     draft.folder = drafts.id;
+                    draft.msgid = draft.generateMessageId();
 
                     if (ref != null) {
                         draft.thread = ref.thread;

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

@@ -722,6 +722,8 @@ public class ServiceSynchronize extends LifecycleService {
                     try {
                         JSONArray jargs = new JSONArray(op.args);
                         EntityMessage message = db.message().getMessage(op.message);
+                        if (message == null)
+                            throw new MessageRemovedException();
 
                         if (EntityOperation.SEEN.equals(op.name))
                             doSeen(folder, ifolder, message, jargs);