Offer "Reveal in editor" menu for elements whose parents have an editor

* Editor should implement navigateTo() to show element (e.g., data type
  definition)

Issue-Ref: 4202
Issue-Url: https://af3-developer.fortiss.org/issues/4202
Issue-Ref: 4162
Issue-Url: https://af3-developer.fortiss.org/issues/4162



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

org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/extension/.ratings

@@ -7,4 +7,4 @@ ITutorialStepUI.java b8aee2b95857484ab6ad9ecd55b5de9f0ea158e5 GREEN
 ITutorialUIProvider.java aa0ff5db4d7ba0953e34edeb99f3e8279567e18f GREEN
 ITutorialUIWhitelistProvider.java d703c1531c6ae7677c2d94cbc95d498dfa4a7e9b GREEN
 ModelEditorNotAvailableBinding.java ba0ea0fe9004cf16579d053d0ddf7eb3f35ed101 GREEN
-RevealMenu.java 36ef1d0ccb2f07f2c124509614a6d5103e303eab GREEN
+RevealMenu.java e1c1a36da89ab3dac6e85c0d99425b4753a3da62 YELLOW

org.fortiss.tooling.kernel.ui/src/org/fortiss/tooling/kernel/ui/extension/RevealMenu.java

@@ -83,6 +83,18 @@ public class RevealMenu implements IContextMenuContributor {
 		}
 	}
 
+	/** Predicate if there are ModelEditorBindings for {@code element}. */
+	private boolean hasBindings(EObject element) {
+		List<IModelEditorBinding<EObject>> bindings =
+				IModelEditorBindingService.getInstance().getBindings(element);
+		if(bindings.isEmpty()) {
+			return false;
+		}
+
+		// get(0): Size of bindings is 1
+		return !(bindings.size() == 1 && bindings.get(0) instanceof ModelEditorNotAvailableBinding);
+	}
+
 	/** {@inheritDoc} */
 	@Override
 	public List<IContributionItem> getContributedItems(EObject selection,
@@ -101,11 +113,7 @@ public class RevealMenu implements IContextMenuContributor {
 			return emptyList();
 		}
 
-		List<IModelEditorBinding<EObject>> bindings =
-				IModelEditorBindingService.getInstance().getBindings(element);
-		// get(0): Size of bindings is 1
-		if(bindings.isEmpty() ||
-				bindings.size() == 1 && bindings.get(0) instanceof ModelEditorNotAvailableBinding) {
+		if(!hasBindings(element) && !hasBindings(parentElement)) {
 			return emptyList();
 		}