C++: Resolve function-scope typedef inside lambda

Use-case:
struct Foo { int bar; };

void func()
{
    typedef Foo F;
    []() {
        F f;
        f.bar; // bar not highlighted
    };
}

Change-Id: Ifaee2d125931d993acad69f03031a675c6180858
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@theqtcompany.com>

src/libs/cplusplus/TypeResolver.cpp

@@ -154,6 +154,13 @@ QList<LookupItem> TypeResolver::typedefsFromScopeUpToFunctionScope(const Name *n
             }
         }
         enclosingBlockScope = block->enclosingScope();
+        if (enclosingBlockScope) {
+            // For lambda, step beyond the function to its enclosing block
+            if (Function *enclosingFunction = enclosingBlockScope->asFunction()) {
+                if (!enclosingFunction->name())
+                    enclosingBlockScope = enclosingBlockScope->enclosingScope();
+            }
+        }
     }
     return results;
 }

src/plugins/cpptools/cppcompletion_test.cpp

@@ -2547,6 +2547,21 @@ void CppToolsPlugin::test_completion_data()
         ) << _("ar") << (QStringList()
             << QLatin1String("arg1"));
 
+    QTest::newRow("local_typedef_access_in_lambda") << _(
+            "struct Foo { int bar; };\n"
+            "\n"
+            "void func()\n"
+            "{\n"
+            "    typedef Foo F;\n"
+            "    []() {\n"
+            "        F f;\n"
+            "        @\n"
+            "    };\n"
+            "}\n"
+    ) << _("f.") << (QStringList()
+            << QLatin1String("Foo")
+            << QLatin1String("bar"));
+
     QTest::newRow("default_arguments_for_class_templates_and_base_class_QTCREATORBUG-12605") << _(
             "struct Foo { int foo; };\n"
             "template <typename T = Foo>\n"