Added navigation to source of constructor.

#KT-3168 fixed

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

@@ -57,6 +57,13 @@ public class JetClsNavigationPolicy implements ClsCustomNavigationPolicy {
                 return sourceFunction;
             }
         }
+        else if (jetDeclaration instanceof JetClass) {
+            assert clsMethod.getReturnType() == null; // constructor
+            JetClassOrObject sourceClass = JetSourceNavigationHelper.getSourceClass((JetClass) jetDeclaration);
+            if (sourceClass != null) {
+                return sourceClass;
+            }
+        }
         return jetDeclaration;
     }
 

idea/testData/libraries/usercode/Constructor.kt

@@ -0,0 +1,6 @@
+import testData.libraries.*
+
+val x: ClassWithConstructor = ClassWithConstructor("abc", 239)
+
+// main.kt
+//public class <1><2>ClassWithConstructor(val a: String, b: Any)

idea/testData/libraries/usercode/ExtensionProperty.kt

@@ -17,6 +17,6 @@ fun foo() {
 //    return this
 //}
 //
-//public class Pair<A, B>(val first: A, val second: B)
+//public class <2>Pair<A, B>(val first: A, val second: B)
 //
-//public val <T> Pair<T, T>.<2>exProp : String
+//public val <T> Pair<T, T>.<3>exProp : String

idea/tests/org/jetbrains/jet/plugin/libraries/LibrariesWithSourcesTest.java

@@ -75,6 +75,10 @@ public class LibrariesWithSourcesTest extends AbstractLibrariesTest {
         doTest();
     }
 
+    public void testConstructor() {
+        doTest();
+    }
+
     private void doTest() {
         userFile = LocalFileSystem.getInstance().findFileByPath(TEST_DATA_PATH + "/usercode/" + getTestName(false) + ".kt");
         assertNotNull(userFile);