Call Hierarchy: Forbid interfaces

#EA-64406 Fixed

idea/src/org/jetbrains/kotlin/idea/hierarchy/HierarchyUtils.java

@@ -38,7 +38,8 @@ public class HierarchyUtils {
                    input instanceof JetFile ||
                    input instanceof JetNamedFunction ||
                    input instanceof JetSecondaryConstructor ||
-                   input instanceof JetClassOrObject ||
+                   input instanceof JetObjectDeclaration ||
+                   (input instanceof JetClass && !((JetClass) input).isInterface()) ||
                    input instanceof JetProperty;
         }
     };

idea/src/org/jetbrains/kotlin/idea/hierarchy/calls/KotlinCallHierarchyProvider.java

@@ -30,6 +30,7 @@ import com.intellij.psi.PsiFile;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.kotlin.idea.hierarchy.HierarchyUtils;
 import org.jetbrains.kotlin.idea.util.ProjectRootsUtil;
+import org.jetbrains.kotlin.psi.JetFile;
 
 public class KotlinCallHierarchyProvider implements HierarchyProvider {
     @Override
@@ -40,7 +41,10 @@ public class KotlinCallHierarchyProvider implements HierarchyProvider {
         PsiElement element = getCurrentElement(dataContext, project);
         if (element == null) return null;
 
-        return HierarchyUtils.getCallHierarchyElement(element);
+        element = HierarchyUtils.getCallHierarchyElement(element);
+        if (element instanceof JetFile) return null;
+
+        return element;
     }
 
     private static PsiElement getCurrentElement(DataContext dataContext, Project project) {

idea/testData/hierarchy/calls/callees/kotlinInterface/main0.kt

@@ -0,0 +1,5 @@
+interface <caret>T
+
+class A : T {
+    val t: T? = null
+}

idea/testData/hierarchy/calls/callees/kotlinInterface/messages.txt

@@ -0,0 +1 @@
+Cannot apply action for element at caret

idea/testData/hierarchy/calls/callers/kotlinInterface/main0.kt

@@ -0,0 +1,5 @@
+interface <caret>T
+
+class A : T {
+    val t: T? = null
+}

idea/testData/hierarchy/calls/callers/kotlinInterface/messages.txt

@@ -0,0 +1 @@
+Cannot apply action for element at caret

idea/tests/org/jetbrains/kotlin/idea/hierarchy/HierarchyTestGenerated.java

@@ -316,6 +316,12 @@ public class HierarchyTestGenerated extends AbstractHierarchyTest {
             doCallerHierarchyTest(fileName);
         }
 
+        @TestMetadata("kotlinInterface")
+        public void testKotlinInterface() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("idea/testData/hierarchy/calls/callers/kotlinInterface/");
+            doCallerHierarchyTest(fileName);
+        }
+
         @TestMetadata("kotlinLocalClass")
         public void testKotlinLocalClass() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("idea/testData/hierarchy/calls/callers/kotlinLocalClass/");
@@ -457,6 +463,12 @@ public class HierarchyTestGenerated extends AbstractHierarchyTest {
             doCalleeHierarchyTest(fileName);
         }
 
+        @TestMetadata("kotlinInterface")
+        public void testKotlinInterface() throws Exception {
+            String fileName = JetTestUtils.navigationMetadata("idea/testData/hierarchy/calls/callees/kotlinInterface/");
+            doCalleeHierarchyTest(fileName);
+        }
+
         @TestMetadata("kotlinLocalClass")
         public void testKotlinLocalClass() throws Exception {
             String fileName = JetTestUtils.navigationMetadata("idea/testData/hierarchy/calls/callees/kotlinLocalClass/");