Navigate to unified inbox from notification or widget

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

@@ -359,15 +359,20 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
         Intent intent = getIntent();
         String action = intent.getAction();
         Log.i(Helper.TAG, "View intent=" + intent + " action=" + action);
-        if (action != null && action.startsWith("thread")) {
+        if (action != null) {
             intent.setAction(null);
             setIntent(intent);
 
-            ViewModelMessages model = ViewModelProviders.of(this).get(ViewModelMessages.class);
-            model.setMessages(null);
+            if ("unified".equals(action))
+                getSupportFragmentManager().popBackStack("unified", 0);
+
+            else if (action.startsWith("thread")) {
+                ViewModelMessages model = ViewModelProviders.of(this).get(ViewModelMessages.class);
+                model.setMessages(null);
 
-            intent.putExtra("thread", action.split(":", 2)[1]);
-            onViewThread(intent);
+                intent.putExtra("thread", action.split(":", 2)[1]);
+                onViewThread(intent);
+            }
         }
 
         if (getIntent().hasExtra(Intent.EXTRA_PROCESS_TEXT)) {

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

@@ -384,6 +384,7 @@ public class ServiceSynchronize extends LifecycleService {
 
         // Build pending intent
         Intent view = new Intent(this, ActivityView.class);
+        view.setAction("unified");
         view.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
         PendingIntent piView = PendingIntent.getActivity(
                 this, ActivityView.REQUEST_UNIFIED, view, PendingIntent.FLAG_UPDATE_CURRENT);

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

@@ -47,6 +47,7 @@ public class Widget extends AppWidgetProvider {
 
     private static void update(int[] appWidgetIds, AppWidgetManager appWidgetManager, Context context, int count) {
         Intent intent = new Intent(context, ActivityView.class);
+        intent.setAction("unified");
         intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
         PendingIntent pi = PendingIntent.getActivity(context, ActivityView.REQUEST_UNIFIED, intent, PendingIntent.FLAG_UPDATE_CURRENT);
         for (int id : appWidgetIds) {