Improve default SMS subscription id intelligence

Fixes #5266
// FREEBIE

src/org/thoughtcrime/securesms/database/RecipientPreferenceDatabase.java

@@ -10,6 +10,7 @@ import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.util.Log;
 
+import org.greenrobot.eventbus.EventBus;
 import org.thoughtcrime.securesms.color.MaterialColor;
 import org.thoughtcrime.securesms.recipients.RecipientFactory;
 import org.thoughtcrime.securesms.recipients.Recipients;
@@ -140,6 +141,7 @@ public class RecipientPreferenceDatabase extends Database {
     ContentValues values = new ContentValues();
     values.put(DEFAULT_SUBSCRIPTION_ID, defaultSubscriptionId);
     updateOrInsert(recipients, values);
+    EventBus.getDefault().post(new RecipientPreferenceEvent(recipients));
   }
 
   public void setBlocked(Recipients recipients, boolean blocked) {
@@ -284,4 +286,17 @@ public class RecipientPreferenceDatabase extends Database {
       return getCurrent();
     }
   }
+
+  public static class RecipientPreferenceEvent {
+
+    private final Recipients recipients;
+
+    public RecipientPreferenceEvent(Recipients recipients) {
+      this.recipients = recipients;
+    }
+
+    public Recipients getRecipients() {
+      return recipients;
+    }
+  }
 }

src/org/thoughtcrime/securesms/database/SmsDatabase.java

@@ -567,6 +567,10 @@ public class SmsDatabase extends MessagingDatabase {
         DatabaseFactory.getThreadDatabase(context).update(threadId, true);
       }
 
+      if (message.getSubscriptionId() != -1) {
+        DatabaseFactory.getRecipientPreferenceDatabase(context).setDefaultSubscriptionId(recipients, message.getSubscriptionId());
+      }
+
       notifyConversationListeners(threadId);
       jobManager.add(new TrimThreadJob(context, threadId));