[REG] OSX: QWidget::showMaximized()/showMinimized() don't work when Qt::FramelessWindowHint was set

When I custom the Window,so I should setWindowFlags(Qt::FramelessWindowHint),and Add Minimize button,When I clicke the button to set Minimize status,It's not effect。
the follow code:
setWindowFlags(Qt::FramelessWindowHint | Qt::Window);

minmize code:

 if(gBDFrameView->isMaximized()){
        gBDFrameView->showNormal();
    }else{
        gBDFrameView->showMaximized();
    }

but in china some one repair this bug
here is a solution：
open qt source code in qt/qtbase/src/plugins/platforms/cocoa.pro
modify this qcocoawindow.mm
this modified code can find in the attachment