Attempt to workaround ConstraintLayout issue

Refs androidx/constraintlayout#430

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

@@ -1589,8 +1589,10 @@ public class AdapterMessage extends RecyclerView.Adapter<AdapterMessage.ViewHold
             ConstraintLayout cl = (ConstraintLayout) flow.getParent();
             for (int id : flow.getReferencedIds()) {
                 View v = cl.findViewById(id);
-                flow.removeView(v);
+                // flow.removeView(v);
-                cl.removeView(v);
+                // cl.removeView(v);
+                // https://github.com/androidx/constraintlayout/issues/430
+                v.setVisibility(View.GONE);
             }
         }