Fix migration of group names when creating Notification Channels.

src/org/thoughtcrime/securesms/database/helpers/SQLCipherOpenHelper.java

@@ -261,6 +261,18 @@ public class SQLCipherOpenHelper extends SQLiteOpenHelper {
             String  displayName     = NotificationChannels.getChannelDisplayNameFor(context, systemName, profileName, address);
             boolean vibrateEnabled  = vibrateState == 0 ? TextSecurePreferences.isNotificationVibrateEnabled(context) : vibrateState == 1;
 
+            if (address.isGroup()) {
+              try(Cursor groupCursor = db.rawQuery("SELECT title FROM groups WHERE group_id = ?", new String[] { address.toGroupString() })) {
+                if (groupCursor != null && groupCursor.moveToFirst()) {
+                  String title = groupCursor.getString(groupCursor.getColumnIndexOrThrow("title"));
+
+                  if (!TextUtils.isEmpty(title)) {
+                    displayName = title;
+                  }
+                }
+              }
+            }
+
             String channelId = NotificationChannels.createChannelFor(context, address, displayName, messageSoundUri, vibrateEnabled);
 
             ContentValues values = new ContentValues(1);

src/org/thoughtcrime/securesms/recipients/Recipient.java

@@ -17,7 +17,6 @@
  */
 package org.thoughtcrime.securesms.recipients;
 
-import android.app.NotificationChannel;
 import android.content.Context;
 import android.graphics.drawable.Drawable;
 import android.net.Uri;