Added test for navigating to library sources when same function FQ name is defined in separate source files.

#KT-1681 in progress

idea/testData/libraries/usercode/SameNameInDifferentSources.kt

@@ -0,0 +1,11 @@
+import testData.libraries.*
+
+fun foo() {
+    func("5")
+    func(5)
+}
+
+// extra.kt
+//public fun <1>func(str : String) {
+// main.kt
+//public fun <2>func(a : Int, b : String = "55") {

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

@@ -70,6 +70,10 @@ public class LibrariesWithSourcesTest extends AbstractLibrariesTest {
         doTest();
     }
 
+    public void testSameNameInDifferentSources() {
+        doTest();
+    }
+
     private void doTest() {
         userFile = LocalFileSystem.getInstance().findFileByPath(TEST_DATA_PATH + "/usercode/" + getTestName(false) + ".kt");
         assertNotNull(userFile);