Fixed previous/next cross account

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

@@ -464,13 +464,13 @@ public class FragmentMessages extends FragmentEx {
         bottom_navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
             @Override
             public boolean onNavigationItemSelected(@NonNull MenuItem menuItem) {
-                String[] pn = (String[]) bottom_navigation.getTag();
-                String thread = (menuItem.getItemId() == R.id.action_prev ? pn[0] : pn[1]);
+                ViewModelMessages.AccountThread[] pn = (ViewModelMessages.AccountThread[]) bottom_navigation.getTag();
+                ViewModelMessages.AccountThread target = (menuItem.getItemId() == R.id.action_prev ? pn[0] : pn[1]);
                 LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(getContext());
                 lbm.sendBroadcast(
                         new Intent(ActivityView.ACTION_VIEW_THREAD)
-                                .putExtra("account", account)
-                                .putExtra("thread", thread));
+                                .putExtra("account", target.account)
+                                .putExtra("thread", target.thread));
                 return true;
             }
         });
@@ -587,7 +587,7 @@ public class FragmentMessages extends FragmentEx {
         if (viewType == AdapterMessage.ViewType.THREAD) {
             // Navigation
             ViewModelMessages model = ViewModelProviders.of(getActivity()).get(ViewModelMessages.class);
-            String[] pn = model.getPrevNext(thread);
+            ViewModelMessages.AccountThread[] pn = model.getPrevNext(thread);
             bottom_navigation.setTag(pn);
             bottom_navigation.getMenu().findItem(R.id.action_prev).setEnabled(pn[0] != null);
             bottom_navigation.getMenu().findItem(R.id.action_next).setEnabled(pn[1] != null);

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

@@ -10,9 +10,9 @@ public class ViewModelMessages extends ViewModel {
         this.messages = messages;
     }
 
-    String[] getPrevNext(String thread) {
+    AccountThread[] getPrevNext(String thread) {
         if (messages == null)
-            return new String[]{null, null};
+            return new AccountThread[]{null, null};
 
         boolean found = false;
         TupleMessageEx prev = null;
@@ -31,6 +31,18 @@ public class ViewModelMessages extends ViewModel {
             else
                 prev = item;
         }
-        return new String[]{prev == null ? null : prev.thread, next == null ? null : next.thread};
+        return new AccountThread[]{
+                prev == null ? null : new AccountThread(prev.account, prev.thread),
+                next == null ? null : new AccountThread(next.account, next.thread)};
+    }
+
+    class AccountThread {
+        long account;
+        String thread;
+
+        AccountThread(long account, String thread) {
+            this.account = account;
+            this.thread = thread;
+        }
     }
 }