[Python] QScrollArea.ensureWidgetVisible method does not show target widget

I am trying to make the last QPushButton visible by using method QScrollArea().ensureWidgetVisible(), but as you can see this method doesn't scroll till the last QPushButton.

Example



Could you please assist and solve my issue perhaps issue with setFrameStyle? thank you in advance.

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *


class Widget(QWidget):

def __init__(self, parent= None):
super(Widget, self).__init__()
self.setFixedHeight(200)

#Container Widget
widget = QWidget()
#Layout of Container Widget
layout = QVBoxLayout(self)
for _ in range(20):
btn = QPushButton("test")
layout.addWidget(btn)
widget.setLayout(layout)


#Scroll Area Properties
scroll = QScrollArea()
scroll.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
scroll.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
scroll.setWidgetResizable(False)
scroll.setWidget(widget)

# print(scroll.verticalScrollBar().maximum())
# vbar = scroll.verticalScrollBar()
# vbar.setValue(vbar.maximum())
#vbar.setValue(vbar.maximum())


#Scroll Area Layer add
vLayout = QVBoxLayout(self)
vLayout.addWidget(scroll)
self.setLayout(vLayout)


# items = (layout.itemAt(i) for i in range(layout.count()))
# for w in items:
# print(w)
print(layout.count())
#scroll.ensureWidgetVisible(layout.itemAt(layout.count()-5).widget(), xMargin=10, yMargin=10 )
scroll.ensureWidgetVisible(layout.itemAt(layout.count()-1).widget() )
print(layout.itemAt(layout.count()-1).widget(),"last widget")


if __name__ == '__main__':
app = QApplication(sys.argv)
dialog = Widget()
dialog.show()

app.exec_()

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