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

@@ -531,6 +531,9 @@ void TypePrettyPrinter::visit(Function *type)
 
         // add exception specifier
         if (const StringLiteral *spec = type->exceptionSpecification()) {
+            if (type->refQualifier() != Function::NoRefQualifier)
+                _text.append(' ');
+            else
                 appendSpace();
             _text += QLatin1String(spec->chars());
         }