Merge branch '3935' into 'master'

[3935] Disable direct creation of curved links between hierarchic element bases

See merge request !90

org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/editor/fx/controller/.ratings

 ContextMenuUtil.java 405387151d45b09dffb3b6ba44f980313c8edcaf GREEN
-CurvedLinkLayoutedContentAnchorangeController.java 67c20e31ddb82fe2fd499117193353b0545839a0 GREEN
+CurvedLinkLayoutedContentAnchorangeController.java 6d2b64c3d6c813ac001b1500ed0529ad6e561aaf GREEN
 EObjectDiagramController.java 2b253941592ee25ead95223470f983f23ef9776f GREEN
 EObjectEllipticResizableContentControllerBase.java 7c862a03b97d2f2cfdcc2fcee7434de2e1e257d2 GREEN
 EObjectModelChangeProvider.java f4b60cebb088a5c81ca92a41614e1a5d40030502 GREEN

org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/editor/fx/controller/CurvedLinkLayoutedContentAnchorangeController.java

@@ -19,6 +19,7 @@ import static org.fortiss.tooling.base.ui.utils.LayoutDataUIUtils.addConnectionP
 
 import org.fortiss.tooling.base.model.base.EntryConnectorBase;
 import org.fortiss.tooling.base.model.base.ExitConnectorBase;
+import org.fortiss.tooling.base.model.base.HierarchicElementBase;
 import org.fortiss.tooling.base.model.element.IConnection;
 import org.fortiss.tooling.base.model.element.IConnector;
 import org.fortiss.tooling.base.model.layout.ILayoutedModelElement;
@@ -46,6 +47,13 @@ public class CurvedLinkLayoutedContentAnchorangeController<T extends IConnector
 	@Override
 	protected void link(IMVCBundle startBundle, DiagramCoordinate startLocation,
 			IMVCBundle endBundle, DiagramCoordinate endLocation) {
+		// Disable direct links between hierarchic element bases
+		if(startBundle.getModel() instanceof HierarchicElementBase ||
+				endBundle.getModel() instanceof HierarchicElementBase) {
+			return;
+		}
+
+		// Create the connection
 		super.link(startBundle, startLocation, endBundle, endLocation);
 
 		// Fetch newly created connection by comparing incoming and outgoing connections of the