Identity return replaced with method call

GUI/src/main/java/cz/fidentis/analyst/distance/DistanceAction.java

@@ -78,7 +78,7 @@ public class DistanceAction extends ControlPanelAction {
                         fpWeights.getValue() // ... compute average FP weight over all its facets
                                 .values()
                                 .stream()
-                                .mapToDouble(weight -> weight)
+                                .mapToDouble(Double::doubleValue)
                                 .average()
                                 .orElse(Double.NaN)))
                 .filter(fpWeight -> !Double.isNaN(fpWeight.getValue())) // Filter out feature points with Double.NaN weight
@@ -298,7 +298,7 @@ public class DistanceAction extends ControlPanelAction {
                                         weights -> weights.getValue() // ... compute average FP weight over all its facets
                                                 .values()
                                                 .stream()
-                                                .mapToDouble(weight -> weight)
+                                                .mapToDouble(Double::doubleValue)
                                                 .average()
                                                 .orElse(Double.NaN))));
     }
@@ -313,13 +313,13 @@ public class DistanceAction extends ControlPanelAction {
                         .values()
                         .stream()
                         .flatMap(List::stream)
-                        .mapToDouble(distance -> distance)
+                        .mapToDouble(Double::doubleValue)
                         .summaryStatistics(),
                 weightedHausdorffDistance
                         .values()
                         .stream()
                         .flatMap(List::stream)
-                        .mapToDouble(distance -> distance)
+                        .mapToDouble(Double::doubleValue)
                         .summaryStatistics()
         );
     }