Max 3 search suggestions

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

@@ -593,8 +593,8 @@ public interface DaoMessage {
             " GROUP BY sender" +
 
             " ORDER BY sender, subject" +
-            " LIMIT 5")
-    Cursor getSuggestions(Long account, Long folder, String query);
+            " LIMIT :limit")
+    Cursor getSuggestions(Long account, Long folder, String query, int limit);
 
     @Query("SELECT language FROM message" +
             " WHERE (:account IS NULL OR message.account = :account)" +

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

@@ -57,6 +57,8 @@ import java.util.Calendar;
 import java.util.List;
 
 public class FragmentDialogSearch extends FragmentDialogBase {
+    private static final int MAX_SUGGESTIONS = 3;
+
     @NonNull
     @Override
     public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
@@ -141,7 +143,8 @@ public class FragmentDialogSearch extends FragmentDialogBase {
                 return db.message().getSuggestions(
                         account < 0 ? null : account,
                         folder < 0 ? null : folder,
-                        "%" + query + "%");
+                        "%" + query + "%",
+                        MAX_SUGGESTIONS);
             }
         });