IntroduceVariableIntentionAction: stop at code block

To prevent escaping lambda/anonymous class

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/introduceVariable/beforeStopAtBlock.java

@@ -0,0 +1,11 @@
+// "Introduce local variable" "false"
+class a {
+  Runnable a() {
+    return new Runnable() {
+      public void run() {
+        if(2+<caret>2 == 5) {}
+      }
+    };
+  }
+}
+