resolve KDoc references to members of companion object

idea/idea-analysis/src/org/jetbrains/kotlin/idea/kdoc/KDocReference.kt

@@ -138,10 +138,17 @@ private fun getClassInnerScope(outerScope: LexicalScope, descriptor: ClassDescri
             addFunctionDescriptor(constructor)
         }
     }
+
+    val scopeChain = arrayListOf(descriptor.defaultType.memberScope,
+                            descriptor.staticScope)
+
+    descriptor.companionObjectDescriptor?.let {
+        scopeChain.add(it.defaultType.memberScope)
+    }
+
     return LexicalChainedScope(headerScope, descriptor, false, null,
                                "Class ${descriptor.name} scope",
-                               descriptor.defaultType.memberScope,
-                               descriptor.staticScope)
+                               *scopeChain.toTypedArray())
 }
 
 public fun getResolutionScope(resolutionFacade: ResolutionFacade, descriptor: DeclarationDescriptor): LexicalScope {

idea/testData/kdoc/resolve/CompanionObjectMember.kt

@@ -0,0 +1,13 @@
+/** See [Foo.b<caret>ar] */
+class T {
+
+}
+
+class Foo {
+    companion object {
+        fun bar() {
+        }
+    }
+}
+
+// REF: (in Foo.Companion).bar()

idea/tests/org/jetbrains/kotlin/idea/kdoc/KdocResolveTestGenerated.java

@@ -60,6 +60,12 @@ public class KdocResolveTestGenerated extends AbstractReferenceResolveTest {
         doTest(fileName);
     }
 
+    @TestMetadata("CompanionObjectMember.kt")
+    public void testCompanionObjectMember() throws Exception {
+        String fileName = KotlinTestUtils.navigationMetadata("idea/testData/kdoc/resolve/CompanionObjectMember.kt");
+        doTest(fileName);
+    }
+
     @TestMetadata("ConstructorParamReference.kt")
     public void testConstructorParamReference() throws Exception {
         String fileName = KotlinTestUtils.navigationMetadata("idea/testData/kdoc/resolve/ConstructorParamReference.kt");