Fixed EA-63622 - IAE: FqName.validateFqName

idea/testData/completion/basic/common/ExtensionFunctionInClassObject.kt

@@ -0,0 +1,13 @@
+package p
+
+class B
+
+class R {
+    class object {
+        fun B.f() {
+            this.<caret>
+        }
+    }
+}
+
+// EXIST: { itemText: "f", tailText: "() for B in class object for R" }