Rework MeshView ContextMenu to allow copying of GML-ID

CityDoctorParent/Extensions/CityDoctorGUI/src/main/java/de/hft/stuttgart/citydoctor2/gui/VertexClickHandler.java

 package de.hft.stuttgart.citydoctor2.gui;
 
+import de.hft.stuttgart.citydoctor2.datastructure.*;
+import de.hft.stuttgart.citydoctor2.gui.tree.FeatureNode;
+import de.hft.stuttgart.citydoctor2.utils.Localization;
+import javafx.scene.input.Clipboard;
+import javafx.scene.input.ClipboardContent;
 import org.locationtech.proj4j.ProjCoordinate;
 
-import de.hft.stuttgart.citydoctor2.datastructure.Polygon;
-import de.hft.stuttgart.citydoctor2.datastructure.Vertex;
 import de.hft.stuttgart.citydoctor2.gui.tree.Renderable;
 import de.hft.stuttgart.citydoctor2.parser.ParserConfiguration;
 import javafx.scene.control.ContextMenu;
@@ -15,6 +18,8 @@ import javafx.scene.input.MouseButton;
 import javafx.scene.input.MouseEvent;
 import javafx.stage.Stage;
 
+import static javafx.scene.input.Clipboard.getSystemClipboard;
+
 public class VertexClickHandler implements ClickHandler {
 	
 	private TreeView<Renderable> errorView;
@@ -38,8 +43,21 @@ public class VertexClickHandler implements ClickHandler {
 			errorView.getSelectionModel().clearSelection();
 			renderer.highlight(p);
 		} else if (me.getButton() == MouseButton.SECONDARY) {
-			MenuItem mi = new MenuItem(p.getGmlId().getGmlString());
-			ContextMenu cMenu = new ContextMenu(mi);
+			ContextMenu cMenu = new ContextMenu();
+
+			MenuItem clipMi = new MenuItem(Localization.getText("MainWindow.copyId"));
+			clipMi.setOnAction(ea -> {
+				CityObject parent = p.getParent().getParent();
+				if (parent instanceof BoundarySurface bs) {
+					parent = bs.getParent();
+
+				}
+				Clipboard clipboard = getSystemClipboard();
+				ClipboardContent content = new ClipboardContent();
+				content.putString(parent.getGmlId().toString());
+				clipboard.setContent(content);
+			});
+			cMenu.getItems().add(clipMi);
 			cMenu.show(stage, me.getScreenX(), me.getScreenY());
 		}
 	}