AutoLayoutMenu: Avoid class cast exception

* Not all IConnectors are necessarily ILayoutedModelElements

Issue-Ref: 3813
Issue-Url: https://af3-developer.fortiss.org/issues/3813



Signed-off-by: Simon Barner <barner@fortiss.org>

org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/layout/auto/.ratings

-AutoLayoutMenu.java bca7986c209678ed937548a37db494430877d80e GREEN
+AutoLayoutMenu.java 67dc2d04a6f39ec72ea640b745997baa8ff63a49 YELLOW
 DiagramTapeMeasure.java 72454e6fe5225dab11d3d691baad93aab7a171c0 GREEN
 IAutoLayouter.java de1b11d9e202c7e23352ad85684dbf8a3fd17c7d GREEN
 IAutoLayouterTapeMeasure.java df186e0ba505e0ecda211b1df76cf12f3245b47e GREEN

org.fortiss.tooling.base.ui/src/org/fortiss/tooling/base/ui/layout/auto/AutoLayoutMenu.java

@@ -82,8 +82,10 @@ public class AutoLayoutMenu implements IContextMenuContributor {
 	 * outgoing {@link IConnection}.
 	 */
 	private boolean hasConnectedConnectorWithAngle(IHierarchicElement element) {
-		for(IConnector connector : element.getConnectors()) {
-			if(getAngle((ILayoutedModelElement)connector, CONNECTOR_ANGLE) != null) {
+		for(ILayoutedModelElement conLayouted : pickInstanceOf(ILayoutedModelElement.class,
+				element.getConnectors())) {
+			if(getAngle(conLayouted, CONNECTOR_ANGLE) != null) {
+				IConnector connector = (IConnector)conLayouted;
 				return !connector.getIncoming().isEmpty() || !connector.getOutgoing().isEmpty();
 			}
 		}