ensure public inner inside interface (IDEA-118564)

java/java-impl/src/com/intellij/codeInsight/daemon/impl/quickfix/CreateInnerClassFromNewFix.java

@@ -54,7 +54,11 @@ public class CreateInnerClassFromNewFix extends CreateClassFromNewFix {
     PsiClass created = elementFactory.createClass(refName);
     final PsiModifierList modifierList = created.getModifierList();
     LOG.assertTrue(modifierList != null);
-    modifierList.setModifierProperty(PsiModifier.PRIVATE, true);
+    if (targetClass.isInterface()) {
+      modifierList.setModifierProperty(PsiModifier.PACKAGE_LOCAL, true);
+    } else {
+      modifierList.setModifierProperty(PsiModifier.PRIVATE, true);
+    }
     if (PsiUtil.getEnclosingStaticElement(newExpression, targetClass) != null || isInThisOrSuperCall(newExpression)) {
       modifierList.setModifierProperty(PsiModifier.STATIC, true);
     }

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/createInnerClassFromNew/afterInInterface.java

@@ -0,0 +1,13 @@
+// "Create Inner Class 'MyCollection'" "true"
+import java.util.*;
+
+public interface I {
+    public static void main() {
+        Collection c = new MyCollection(1, "test");
+    }
+
+    static class MyCollection implements Collection {
+        public MyCollection(int i, String test) {
+        }
+    }
+}

java/java-tests/testData/codeInsight/daemonCodeAnalyzer/quickFix/createInnerClassFromNew/beforeInInterface.java

@@ -0,0 +1,8 @@
+// "Create Inner Class 'MyCollection'" "true"
+import java.util.*;
+
+public interface I {
+    public static void main() {
+        Collection c = new <caret>MyCollection(1, "test");
+    }
+}