'always activated' code completion is not working during FakeVim mode

in FakeVim mode, enable code completion as 'always activated'.

in source code as below, type "win", no completion list appears. But if FakeVim is disabled, the list will appear.

int main(int argc, char *argv[])
{
QApplication app(argc, argv);
MainWindow window;
window.resize(640, 512);
window.show();

win|
return app.exec();
}