IG: do not suggest qualified this expression on method of local class

plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/style/UnqualifiedMethodAccessInspection.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006-2012 Bas Leijdekkers
+ * Copyright 2006-2016 Bas Leijdekkers
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,6 +17,8 @@ package com.siyeh.ig.style;
 
 import com.intellij.codeInspection.CleanupLocalInspectionTool;
 import com.intellij.psi.*;
+import com.intellij.psi.util.PsiTreeUtil;
+import com.intellij.psi.util.PsiUtil;
 import com.siyeh.InspectionGadgetsBundle;
 import com.siyeh.ig.BaseInspection;
 import com.siyeh.ig.BaseInspectionVisitor;
@@ -70,9 +72,16 @@ public class UnqualifiedMethodAccessInspection extends BaseInspection implements
         return;
       }
       final PsiClass containingClass = method.getContainingClass();
-      if (containingClass instanceof PsiAnonymousClass) {
+      if (containingClass == null) {
         return;
       }
+      if (PsiUtil.isLocalOrAnonymousClass(containingClass)) {
+        final PsiClass expressionClass = PsiTreeUtil.getParentOfType(expression, PsiClass.class);
+        if (expressionClass == null || !expressionClass.equals(containingClass)) {
+          // qualified this expression not possible for anonymous or local class
+          return;
+        }
+      }
       registerError(expression);
     }
   }

plugins/InspectionGadgets/test/com/siyeh/igtest/style/unqualified_method_access/UnqualifiedMethodAccess.java

@@ -14,6 +14,16 @@ public class UnqualifiedMethodAccess extends JPanel {
 
   void foo(String s) {
     this.foo();
+    class A {
+      void a() {
+        <warning descr="Instance method call 'a' is not qualified with 'this'">a</warning>();
+        new Object() {
+          void b() {
+            a();
+          }
+        };
+      }
+    }
   }
 
   void anonymous() {
@@ -22,6 +32,7 @@ public class UnqualifiedMethodAccess extends JPanel {
         new Object() {
           void foo() {
             bar();
+            <warning descr="Instance method call 'foo' is not qualified with 'this'">foo</warning>();
           }
         };
       }