CPlusPlus: Do not try to qualify the names of template parameters

These always appear as written.

Task-number: QTCREATORBUG-28186
Change-Id: Iea8cc99ee6c17c1320817977fdb96ae1f730bc45
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/libs/cplusplus/LookupContext.cpp

@@ -189,6 +189,8 @@ LookupContext &LookupContext::operator=(const LookupContext &other)
 
 QList<const Name *> LookupContext::fullyQualifiedName(Symbol *symbol, InlineNamespacePolicy policy)
 {
+    if (symbol->asTypenameArgument())
+        return {symbol->name()};
     QList<const Name *> qualifiedName = path(symbol->enclosingScope(), policy);
     addNames(symbol->name(), &qualifiedName, /*add all names*/ true);
     return qualifiedName;

src/plugins/cppeditor/cppquickfix_test.cpp

@@ -6869,6 +6869,28 @@ void QuickfixTest::testMoveFuncDefOutsideTemplate()
     QuickFixOperationTest(singleDocument(original, expected), &factory);
 }
 
+void QuickfixTest::testMoveFuncDefOutsideMemberFunctionTemplate()
+{
+    const QByteArray original = R"(
+struct S {
+    template<typename In>
+    void @foo(In in) { (void)in; }
+};
+)";
+    const QByteArray expected = R"(
+struct S {
+    template<typename In>
+    void foo(In in);
+};
+
+template<typename In>
+void S::foo(In in) { (void)in; }
+)";
+
+    MoveFuncDefOutside factory;
+    QuickFixOperationTest(singleDocument(original, expected), &factory);
+}
+
 void QuickfixTest::testMoveFuncDefOutsideTemplateSpecializedClass()
 {
     QByteArray original = R"(

src/plugins/cppeditor/cppquickfix_test.h

@@ -169,6 +169,7 @@ private slots:
     void testMoveFuncDefOutsideRespectWsInOperatorNames2();
     void testMoveFuncDefOutsideMacroUses();
     void testMoveFuncDefOutsideTemplate();
+    void testMoveFuncDefOutsideMemberFunctionTemplate();
     void testMoveFuncDefOutsideTemplateSpecializedClass();
     void testMoveFuncDefOutsideUnnamedTemplate();
     void testMoveFuncDefOutsideMemberFuncToCppStatic();