preserve generics signature on inner class make static fix (IDEA-135223)

plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/memory/InnerClassMayBeStaticInspection.java

@@ -111,8 +111,10 @@ public class InnerClassMayBeStaticInspection extends BaseInspection {
         if (argumentList == null) {
           continue;
         }
-        final PsiExpression expression =
-          factory.createExpressionFromText("new " + classReference.getQualifiedName() + argumentList.getText(), innerClass);
+        final PsiReferenceParameterList parameterList = classReference.getParameterList();
+        final String genericParameters = parameterList != null ? parameterList.getText() : "";
+        final PsiExpression expression = factory
+          .createExpressionFromText("new " + classReference.getQualifiedName() + genericParameters + argumentList.getText(), innerClass);
         codeStyleManager.shortenClassReferences(newExpression.replace(expression));
       }
       final PsiModifierList modifiers = innerClass.getModifierList();

plugins/InspectionGadgets/test/com/siyeh/igfixes/memory/inner_class_static/PreserveGenericSignature.after.java

@@ -0,0 +1,16 @@
+class IdeaTest {
+
+  public void test(){
+    print(new InnerClass<Integer>().foo(Integer.valueOf(1)));
+  }
+
+  public void print(Integer foo){
+    System.out.println(foo);
+  }
+
+  static class InnerClass<T>{
+    public T foo(T bar){
+      return bar;
+    }
+  }
+}

plugins/InspectionGadgets/test/com/siyeh/igfixes/memory/inner_class_static/PreserveGenericSignature.java

@@ -0,0 +1,16 @@
+class IdeaTest {
+
+  public void test(){
+    print(new InnerClass<Integer>().foo(Integer.valueOf(1)));
+  }
+
+  public void print(Integer foo){
+    System.out.println(foo);
+  }
+
+  class Inn<caret>erClass<T>{
+    public T foo(T bar){
+      return bar;
+    }
+  }
+}

plugins/InspectionGadgets/testsrc/com/siyeh/ig/fixes/memory/InnerClassMayBeStaticFixTest.java

@@ -33,8 +33,6 @@ public class InnerClassMayBeStaticFixTest extends IGQuickFixesTestCase {
   }
 
   public void testSimple() { doTest(); }
-
-  public void testAnonymousInside() {
-    doTest();
-  }
+  public void testAnonymousInside() { doTest(); }
+  public void testPreserveGenericSignature() { doTest(); }
 }