Qt5 QFileDialog with preview picture

Hello,

I used Michal Fapsos implementation of this dialog and it worked with Qt 5.6.1 .

Now I am using Qt 5.9.2 and it does not work anymore, giving the following error:

Code:

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Traceback (most recent call last):
  File "main.py", line 74, in mouseDoubleClickEvent
    self.openFileDialog()
  File "main.py", line 123, in openFileDialog
    openDialog = QFileDialogPreview(self, 'Open file', './', self.getDialogFilter())
  File "QFileDialogPreview.py", line 22, in __init__
    self.layout().addLayout(box, 1, 3, 1, 1)
TypeError: addLayout(self, QLayout, stretch: int = 0): too many arguments

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Here is the translated class. I am using Python 3.5.2:

Code:

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from PyQt5.QtWidgets import QFileDialog, QLabel, QVBoxLayout
from PyQt5.QtGui import QPixmap
from PyQt5.QtCore import Qt
 
class QFileDialogPreview(QFileDialog):
    def __init__(self, parent, caption, direcotry, filter):
        super().__init__(parent, caption, direcotry, filter)
 
        self.setObjectName("FileDialogPreview")
        box = QVBoxLayout(self)
 
        self.setFixedSize(self.width() + 250, self.height())
 
        self.mpPreview = QLabel("Preview", self)
        self.mpPreview.setFixedSize(250, 250)
        self.mpPreview.setAlignment(Qt.AlignCenter)
        self.mpPreview.setObjectName("labelPreview")
        box.addWidget(self.mpPreview)
 
        box.addStretch()
 
        self.layout().addLayout(box, 1, 3, 1, 1)
 
        self.currentChanged.connect(self.onChange)
        self.fileSelected.connect(self.onFileSelected)
        self.filesSelected.connect(self.onFilesSelected)
 
        self._fileSelected = None
        self._filesSelected = None
 
    def onChange(self, path):
        pixmap = QPixmap(path)
 
        if(pixmap.isNull()):
            self.mpPreview.setText("Preview")
        else:
            self.mpPreview.setPixmap(pixmap.scaled(self.mpPreview.width(), self.mpPreview.height(), Qt.KeepAspectRatio, Qt.SmoothTransformation))
 
    def onFileSelected(self, file):
        self._fileSelected = file
 
    def onFilesSelected(self, files):
        self._filesSelected = files
 
    def getFileSelected(self):
        return self._fileSelected
 
    def getFilesSelected(self):
        return self._filesSelected

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Has there been a change in the layout of QFileDialog, which should be a QGridLayout, but now is a QVBoxLayout, or is the problem somewhere else?

I am confident in the code working before, since it ran on my linux machine (Qt 5.6.1), but running it on my windows using (Qt 5.9.3) failed with the above error as well.