[PyQt] QScrollArea does not work

[HeinKurz]

Hi!
What's wrong with my code? QScrollArea is shown but scrolling doesn't work.

import sys
import datetime
import xml.etree.ElementTree as ET
from PyQt5.QtWidgets import *  #QApplication, QDialog, QMainWindow, QMessageBox, QPushButton
from PyQt5 import QtWidgets
from PyQt5.QtCore import *
from PyQt5 import QtCore
from PyQt5.QtGui import *
from PyQt5 import QtGui
#from PyQt5 import uic

class MainWindow(QMainWindow):
    def __init__(self):
        super().__init__()

        self.resize(900, 600)
        self.setMinimumSize(900, 600)
        self.setWindowTitle("Gewicht")
        self.setWindowIcon(QIcon("Gewicht.png"))

        # Tab
        tabWidget = QTabWidget(self)
        tabWidget.setContextMenuPolicy(Qt.DefaultContextMenu)
        self.setCentralWidget(tabWidget)
        
        # Tab Daten
        tabDaten = QWidget()
        # ...

        # Tab Grafik
        tabGrafik = QWidget()
        tabWidget.addTab(tabGrafik, "Grafik")

        scrollArea = QScrollArea(tabGrafik)
        scrollArea.setGeometry(10, 100, 870, 430)
        sp2 = QSizePolicy(QSizePolicy.Expanding, QSizePolicy.Fixed)
        sp2.setHorizontalStretch(0)
        sp2.setVerticalStretch(0)
        sp2.setHeightForWidth(scrollArea.sizePolicy().hasHeightForWidth())  # ???
        scrollArea.setSizePolicy(sp2)
        scrollArea.setVerticalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
        scrollArea.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOn)
        scrollArea.setWidgetResizable(False)   # !?!?!?!
        scrollArea.setAutoFillBackground(False)
        sawc = QWidget(scrollArea)   # scrollAreaWidgetContents
        sawc.setGeometry(QRect(1, 1, 1200, 405))
        sp3 = QSizePolicy(QSizePolicy.Fixed, QSizePolicy.Fixed)  # Preferred  !?!?!?
        sp3.setHorizontalStretch(0)
        sp3.setVerticalStretch(0)
        sp3.setHeightForWidth(sawc.sizePolicy().hasHeightForWidth())  # ???
        sawc.setSizePolicy(sp3)
        sawc.setMinimumSize(QSize(1200, 405))    # !?!?!?
        sawc.setStyleSheet("background-color:aquamarine;")
        pushButtonNeu = QPushButton(sawc)
        pushButtonNeu.setText("Neu")
        pushButtonNeu.setGeometry(QRect(10, 20, 1040, 90))
        pushButtonNeu.setStyleSheet("background-color:gray;")

        # Tab Infos
        tabInfos = QWidget()
        tabWidget.addTab(tabInfos, "Infos, Statistik")


        def tabChange(seltab):
            if seltab == 1:
                # ...
            if seltab == 2:
                # ...

        # Actions
        tabWidget.currentChanged.connect(tabChange)


app = QApplication(sys.argv)
window = MainWindow()
window.show()
app.exec()