Added test for case when type from overridden method has same short name as something already present.

#KT-1602 fixed

idea/testData/codeInsight/overrideImplement/sameTypeName/foo/Array.kt

@@ -0,0 +1,9 @@
+//KT-1602
+package lib
+
+public class Array {
+}
+
+public trait ArrayFactory {
+    fun create() : Array
+}

idea/testData/codeInsight/overrideImplement/sameTypeName/foo/Impl.kt

@@ -0,0 +1,6 @@
+//KT-1602
+import lib.ArrayFactory
+
+public class Impl : ArrayFactory {
+    <caret>
+}

idea/testData/codeInsight/overrideImplement/sameTypeName/foo/Impl.kt.after

@@ -0,0 +1,9 @@
+//KT-1602
+import lib.ArrayFactory
+
+public class Impl : ArrayFactory {
+
+    override fun create() : lib.Array {
+        throw UnsupportedOperationException()
+    }
+}