KT-1651 Navigation to enum constants doesn't work for libraries with and without source code

#KT-1651 fixed

idea/src/org/jetbrains/jet/plugin/libraries/JetClsNavigationPolicy.java

@@ -63,7 +63,14 @@ public class JetClsNavigationPolicy implements ClsCustomNavigationPolicy {
     @Override
     @Nullable
     public PsiElement getNavigationElement(@NotNull ClsFieldImpl clsField) {
-        return getJetDeclarationByClsElement(clsField);
+        JetDeclaration jetDeclaration = getJetDeclarationByClsElement(clsField);
+        if (jetDeclaration instanceof JetProperty) {
+            JetDeclaration sourceProperty = JetSourceNavigationHelper.getSourceProperty((JetProperty) jetDeclaration);
+            if (sourceProperty != null) {
+                return sourceProperty;
+            }
+        }
+        return jetDeclaration;
     }
 
     @Nullable

idea/testData/libraries/usercode/Enum.kt

@@ -4,4 +4,5 @@ val color: Color? = Color.RED
 val rgb = color?.rgb
 
 // main.kt
-//public enum class <1><2>Color(val <3>rgb : Int) {
+//public enum class <1><2>Color(val <4>rgb : Int) {
+//    <3>RED : Color(0xFF0000)