CppEditor: Ensure a space between ref qualifier and exception spec

Task-number: QTCREATORBUG-27132
Change-Id: Iedb983f58ece345d5997607d2e557e36c951750f
Reviewed-by: Christian Stenger <christian.stenger@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/libs/cplusplus/TypePrettyPrinter.cpp

@@ -531,7 +531,10 @@ void TypePrettyPrinter::visit(Function *type)
 
         // add exception specifier
         if (const StringLiteral *spec = type->exceptionSpecification()) {
-            appendSpace();
+            if (type->refQualifier() != Function::NoRefQualifier)
+                _text.append(' ');
+            else
+                appendSpace();
             _text += QLatin1String(spec->chars());
         }
     }

src/plugins/cppeditor/cppquickfix_test.cpp

@@ -6137,7 +6137,7 @@ struct Derived : public Base {
     original = "#include \"file.h\"\n";
     expected = R"DELIM(#include "file.h"
 
-auto Derived::func() const &&noexcept -> void {}
+auto Derived::func() const && noexcept -> void {}
 )DELIM";
     testDocuments << CppTestDocument::create("file.cpp", original, expected);