子窗口通过窗口内按钮打开和通过自定义TitleBar 中的菜单按钮打开弹出的窗口边框状态不一样 #153

Window{
    id:mainWindow
    color: "#ffffff"
    width : 1000
    height : 800
    visible : true
    Component.onCompleted: {
        windowAgent.setup(mainWindow)
        mainWindow.visible = true
        
    }
    
    WindowAgent {
        id: windowAgent
    }
    ColumnLayout{
        anchors.fill: parent
        CustomTitleBar{
            id:titleBar
            Layout.preferredHeight: 48
            Layout.fillWidth: true
            
            title:mainWindow.title
            mainWindow: mainWindow
            windowAgent: windowAgent
            onMenuButtonClicked: {
                appMenu.open()
            }
        }
        Button{
            id:button
            text:"button"
            Layout.fillHeight:  true
            onClicked: {
                child.show()
            }
        }
    }
    
    Window{
        id:child
        width: 300
        height: 400
        
        title: qsTr("About")
        modality: Qt.ApplicationModal;
        // visible: true
        Column{
            anchors.fill: parent
            Text {
                id: appName
                anchors.horizontalCenter: parent.horizontalCenter
                text: "App 123"
                font{
                    family:"Arial"
                    bold:true
                    pixelSize: 15
                }
            }
        }
    }
    AppMenu{
        id:appMenu
        onMenuAction:{
            child.show()
        }
    }
    
}