QMetaProperty's isDesignable() allow even those properties which are not shown in Qt Designer.

For a Qt Creator plugin project, I needed to get only those properties of the widgets which Qt Designer shows in the Property Editor.

I read the topic Reading and Writing Properties with the Meta-Object System from the docs at https://doc.qt.io/qt-5/properties.html, I successfully read the properties of QPushButton using the following code: 

QObject *object = new QPushButton;
const QMetaObject *metaobject = object->metaObject();
int count = metaobject->propertyCount();
for (int i=0; i<count; ++i) {
    QMetaProperty metaproperty = metaobject->property(i);
    qDebug()<<qPrintable(QString(metaproperty.name()) + " : " + QString(metaproperty.typeName()));
}

 I noticed that the above code printed not only those properties which Qt Designer displays for the QPushButton in the Property Editor but also many other too!

In the docs i found isDesignable https://doc.qt.io/Qt-5/qmetaproperty.html#isDesignable ,
As the docs says here https://doc.qt.io/qt-5/properties.html that:

"The DESIGNABLE attribute indicates whether the property should be visible in the property editor of GUI design tool (e.g., Qt Designer). "

So I included metaproperty.isDesignable() check in the code so that my code may print only those properties which are intended to be visible in the Qt  Designer:

QObject *object = new QPushButton;
const QMetaObject *metaobject = object->metaObject();
int count = metaobject->propertyCount();
for (int i=0; i<count; ++i) {
    QMetaProperty metaproperty = metaobject->property(i);
    if( metaproperty.isDesignable() ) {
        qDebug()<<qPrintable(QString(metaproperty.name()) + " : " + QString(metaproperty.typeName()));
    }
}

But even with this check I noticed that many properties get printed which are not shown in the Qt Designer!
For example, these properties are shown which I don't find them in Qt Designer: 
windowModality, frameGeometry, normalGeometry, childrenRect, windowIcon, windowIconText, windowOpacity, windowModified, etc.