Resizing issue with the widgets wich inherites QAbstractScrollArea.

In the example below, if I don't set the maximum size for the viewer, I've a view with the size 524278 x 524278. The MainWindow.resize(x, y) has no effect.

This example demonstrate the issue with QGraphicsView, QScrollArea, QPlainTextEdit, etc

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1. coding: utf-8

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_MainWindow(object):
def setupUi(self, MainWindow):
MainWindow.resize(460, 430)
self.centralwidget = QtWidgets.QWidget(MainWindow)
self.grid = QtWidgets.QGridLayout(self.centralwidget)
self.verticalLayout = QtWidgets.QVBoxLayout()
self.view = QtWidgets.QGraphicsView(self.centralwidget)
self.view.setMaximumSize(QtCore.QSize(1000, 600))
self.grid.addWidget(self.view, 0, 0, 1, 1)
MainWindow.setCentralWidget(self.centralwidget)

if _name_ == "_main_":
import sys
app = QtWidgets.QApplication(sys.argv)
MainWindow = QtWidgets.QMainWindow()
ui = Ui_MainWindow()
ui.setupUi(MainWindow)
MainWindow.show()
QtCore.QCoreApplication.processEvents()
print('Viewer size:', ui.view.geometry())
sys.exit(app.exec_())
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Comment the line self.view.setMaximumSize(QtCore.QSize(1000, 600))`to see the issue.