Generate 'toString()': Permit for data classes

#KT-14122 Fixed

idea/src/org/jetbrains/kotlin/idea/actions/generate/KotlinGenerateToStringAction.kt

@@ -126,7 +126,6 @@ class KotlinGenerateToStringAction : KotlinGenerateMemberActionBase<KotlinGenera
         return targetClass is KtClass
                && !targetClass.isAnnotation()
                && !targetClass.isInterface()
-               && !targetClass.hasModifier(KtTokens.DATA_KEYWORD)
     }
 
     override fun prepareMembersInfo(klass: KtClassOrObject, project: Project, editor: Editor?): Info? {

idea/testData/codeInsight/generate/toString/common/dataClass.kt

@@ -1,2 +0,0 @@
-// NOT_APPLICABLE
-data class A<caret>(val n: Int)

idea/testData/codeInsight/generate/toString/multipeTemplates/dataClass.kt

@@ -0,0 +1,2 @@
+// GENERATOR: MULTIPLE_TEMPLATES
+data class A<caret>(val n: Int, val s: String?)

idea/testData/codeInsight/generate/toString/multipeTemplates/dataClass.kt.after

@@ -0,0 +1,9 @@
+// GENERATOR: MULTIPLE_TEMPLATES
+data class A(val n: Int, val s: String?) {
+    override fun toString(): String {
+        return "A(" +
+                "n=$n," +
+                "s=$s" +
+                ")"
+    }
+}

idea/testData/codeInsight/generate/toString/singleTemplate/dataClass.kt

@@ -0,0 +1,2 @@
+// GENERATOR: SINGLE_TEMPLATE
+data class A<caret>(val n: Int, val s: String?)

idea/testData/codeInsight/generate/toString/singleTemplate/dataClass.kt.after

@@ -0,0 +1,6 @@
+// GENERATOR: SINGLE_TEMPLATE
+data class A(val n: Int, val s: String?) {
+    override fun toString(): String {
+        return "A(n=$n, s=$s)"
+    }
+}

idea/tests/org/jetbrains/kotlin/idea/codeInsight/generate/GenerateToStringActionTestGenerated.java

@@ -49,12 +49,6 @@ public class GenerateToStringActionTestGenerated extends AbstractGenerateToStrin
             doTest(fileName);
         }
 
-        @TestMetadata("dataClass.kt")
-        public void testDataClass() throws Exception {
-            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/codeInsight/generate/toString/common/dataClass.kt");
-            doTest(fileName);
-        }
-
         @TestMetadata("interface.kt")
         public void testInterface() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/codeInsight/generate/toString/common/interface.kt");
@@ -88,6 +82,12 @@ public class GenerateToStringActionTestGenerated extends AbstractGenerateToStrin
             doTest(fileName);
         }
 
+        @TestMetadata("dataClass.kt")
+        public void testDataClass() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/codeInsight/generate/toString/multipeTemplates/dataClass.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("multipleVars.kt")
         public void testMultipleVars() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/codeInsight/generate/toString/multipeTemplates/multipleVars.kt");
@@ -139,6 +139,12 @@ public class GenerateToStringActionTestGenerated extends AbstractGenerateToStrin
             doTest(fileName);
         }
 
+        @TestMetadata("dataClass.kt")
+        public void testDataClass() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/codeInsight/generate/toString/singleTemplate/dataClass.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("explicitDefaultAccessors.kt")
         public void testExplicitDefaultAccessors() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/codeInsight/generate/toString/singleTemplate/explicitDefaultAccessors.kt");