Get position from widget state (#23300)

* add position to dto

* add filter on non-null objects

Author: janheise

graylog2-server/src/main/java/org/graylog/plugins/views/search/views/ViewDTO.java

@@ -43,6 +43,7 @@
 import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;
 import java.util.stream.Collectors;
@@ -154,6 +155,15 @@ public Optional<WidgetDTO> findWidgetById(String widgetId) {
                 .findFirst();
     }
 
+    @JsonIgnore
+    public Optional<WidgetPositionDTO> findPositionById(final String widgetId) {
+        return state().values()
+                .stream()
+                .map(q -> q.widgetPositions().get(widgetId))
+                .filter(Objects::nonNull)
+                .findFirst();
+    }
+
     @JsonIgnore
     public Set<WidgetDTO> getAllWidgets() {
         return this.state()