Fixed completion when a typedef symbol is used as class name

For example std::string, which is a typedef of std::basic_string.

Reviewed-by: Thorbjørn Lindeijer <thorbjorn.lindeijer@nokia.com>

src/libs/cplusplus/ResolveExpression.cpp

@@ -645,6 +645,7 @@ ResolveExpression::resolveBaseExpression(const QList<Result> &baseResults, int a
             foreach (Symbol *typedefCandidate, typedefCandidates) {
                 if (typedefCandidate->isTypedef() && typedefCandidate->type()->isNamedType()) {
                     ty = typedefCandidate->type();
+                    lastVisibleSymbol = typedefCandidate;
                     break;
                 }
             }