CppEditor: Consider templates in "complete switch" quickfix

Fixes: QTCREATORBUG-24752
Change-Id: I39bc007e5f493a9826adb4575eb210bf9ec21159
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/cppeditor/cppquickfix_test.cpp

@@ -596,6 +596,32 @@ void CppEditorPlugin::test_quickfix_data()
         ""
     );
 
+    // Checks: complete switch statement where enum is goes via a template type parameter
+    QTest::newRow("CompleteSwitchCaseStatement_QTCREATORBUG-24752")
+        << CppQuickFixFactoryPtr(new CompleteSwitchCaseStatement) << _(
+        "enum E {EA, EB};\n"
+        "template<typename T> struct S {\n"
+        "    static T theType() { return T(); }\n"
+        "};\n"
+        "int main() {\n"
+        "    @switch (S<E>::theType()) {\n"
+        "    }\n"
+        "}\n"
+        ) << _(
+        "enum E {EA, EB};\n"
+        "template<typename T> struct S {\n"
+        "    static T theType() { return T(); }\n"
+        "};\n"
+        "int main() {\n"
+        "    switch (S<E>::theType()) {\n"
+        "    case EA:\n"
+        "        break;\n"
+        "    case EB:\n"
+        "        break;\n"
+        "    }\n"
+        "}\n"
+    );
+
     // Checks:
     // 1. If the name does not start with ("m_" or "_") and does not
     //    end with "_", we are forced to prefix the getter with "get".

src/plugins/cppeditor/cppquickfixes.cpp

@@ -2744,6 +2744,7 @@ Enum *conditionEnum(const CppQuickFixInterface &interface, SwitchStatementAST *s
     Block *block = statement->symbol;
     Scope *scope = interface.semanticInfo().doc->scopeAt(block->line(), block->column());
     TypeOfExpression typeOfExpression;
+    typeOfExpression.setExpandTemplates(true);
     typeOfExpression.init(interface.semanticInfo().doc, interface.snapshot());
     const QList<LookupItem> results = typeOfExpression(statement->condition,
                                                        interface.semanticInfo().doc,