Fixed open group chat updates UI on the background thread.

Fixes #189 #294

src/org/thoughtcrime/securesms/conversation/ConversationActivity.java

@@ -458,7 +458,7 @@ public class ConversationActivity extends PassphraseRequiredActionBarActivity
     PublicChat publicChat = DatabaseFactory.getLokiThreadDatabase(this).getPublicChat(threadId);
     if (publicChat != null) {
       ApplicationContext.getInstance(this).getPublicChatAPI().getChannelInfo(publicChat.getChannel(), publicChat.getServer()).success(displayName -> {
-        updateSubtitleTextView();
+        runOnUiThread(ConversationActivity.this::updateSubtitleTextView);
         return Unit.INSTANCE;
       });
     }
@@ -492,6 +492,7 @@ public class ConversationActivity extends PassphraseRequiredActionBarActivity
 
   @Override
   protected void onNewIntent(Intent intent) {
+    super.onNewIntent(intent);
     Log.i(TAG, "onNewIntent()");
     
     if (isFinishing()) {

src/org/thoughtcrime/securesms/loki/protocol/ClosedGroupsProtocol.kt

@@ -33,6 +33,7 @@ import org.whispersystems.signalservice.loki.utilities.hexEncodedPublicKey
 import org.whispersystems.signalservice.loki.utilities.toHexString
 import java.io.IOException
 import java.util.*
+import kotlin.jvm.Throws
 
 object ClosedGroupsProtocol {
     val isSharedSenderKeysEnabled = false