Recompute Hausdorff distance only if the feature point is selected

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

@@ -142,6 +142,10 @@ public class DistancePanel extends ControlPanel {
             sliderInput.setText(ControlPanelBuilder.doubleToStringLocale(DrawableFeaturePoints.DEFAULT_SIZE));
             sliderInput.postActionEvent(); // Set correct position of slider
             sliderInput.addActionListener((ActionEvent ae) -> {
+                if (!checkBox.isSelected()) {
+                    return; // Recompute only if the feature point is selected
+                }
+                
                 if (ControlPanelBuilder.TEXT_FIELD_BUTTON_PRESSED_MINUS.equals(ae.getActionCommand())
                         || ControlPanelBuilder.TEXT_FIELD_BUTTON_PRESSED_PLUS.equals(ae.getActionCommand())) {
                     action.actionPerformed(new ActionEvent(