CppEditor: Add enclosing template on "Add Definition"

The template id for the class name is missing, but it's better than
nothing.

For example:

template<class T>
class Foo
{
  void func(); // Add Definition
};

// The following lines are added
template<class T>
void Foo::func() // Should be Foo<T>::func
{
}

Change-Id: I60a0cbd348985def3dfb7037067786e942278593
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@qt.io>

src/plugins/cppeditor/cppeditorplugin.h

@@ -145,6 +145,8 @@ private slots:
     void test_quickfix_InsertDefFromDecl_rvalueReference();
     void test_quickfix_InsertDefFromDecl_findImplementationFile();
     void test_quickfix_InsertDefFromDecl_unicodeIdentifier();
+    void test_quickfix_InsertDefFromDecl_templateClass();
+    void test_quickfix_InsertDefFromDecl_templateFunction();
 
     void test_quickfix_InsertDeclFromDef();
     void test_quickfix_InsertDeclFromDef_templateFuncTypename();

src/plugins/cppeditor/cppquickfix_test.cpp

@@ -2668,6 +2668,56 @@ void CppEditorPlugin::test_quickfix_InsertDefFromDecl_unicodeIdentifier()
     QuickFixOperationTest(testDocuments, &factory);
 }
 
+void CppEditorPlugin::test_quickfix_InsertDefFromDecl_templateClass()
+{
+    QByteArray original =
+        "template<class T>\n"
+        "class Foo\n"
+        "{\n"
+        "    void fun@c();\n"
+        "};\n";
+    QByteArray expected =
+        "template<class T>\n"
+        "class Foo\n"
+        "{\n"
+        "    void fun@c();\n"
+        "};\n"
+        "\n"
+        "template<class T>\n"
+        "void Foo::func()\n" // Should really be Foo<T>::func()
+        "{\n"
+        "\n"
+        "}\n";
+
+    InsertDefFromDecl factory;
+    QuickFixOperationTest(singleDocument(original, expected), &factory);
+}
+
+void CppEditorPlugin::test_quickfix_InsertDefFromDecl_templateFunction()
+{
+    QByteArray original =
+        "class Foo\n"
+        "{\n"
+        "    template<class T>\n"
+        "    void fun@c();\n"
+        "};\n";
+    QByteArray expected =
+        "class Foo\n"
+        "{\n"
+        "    template<class T>\n"
+        "    void fun@c();\n"
+        "};\n"
+        "\n"
+        "template<class T>\n"
+        "void Foo::func()\n"
+        "{\n"
+        "\n"
+        "}\n";
+
+    InsertDefFromDecl factory;
+    QuickFixOperationTest(singleDocument(original, expected), &factory);
+}
+
 // Function for one of InsertDeclDef section cases
 void insertToSectionDeclFromDef(const QByteArray &section, int sectionIndex)
 {

src/plugins/cppeditor/cppquickfixes.cpp

@@ -2567,6 +2567,7 @@ public:
         oo.showFunctionSignatures = true;
         oo.showReturnTypes = true;
         oo.showArgumentNames = true;
+        oo.showEnclosingTemplate = true;
 
         if (m_defpos == DefPosInsideClass) {
             const int targetPos = targetFile->position(m_loc.line(), m_loc.column());