pyqtgraph中的图像由于缩放而隐藏

import sys
from PyQt5 import QtWidgets
import pyqtgraph as pg
import numpy as np

class PlotWindow(QtWidgets.QWidget):
    def __init__(self):
        super().__init__()

        self.plot_widget = pg.PlotWidget()
        self.plot_item = self.plot_widget.plotItem
        self.plot_item.setMouseEnabled(x=True, y=True)
        self.plot_item.setMenuEnabled(False)

        layout = QtWidgets.QVBoxLayout()
        layout.addWidget(self.plot_widget)
        self.setLayout(layout)

        self.data = np.random.normal(size=1000)
        self.curve = self.plot_item.plot(self.data, clear=True)

        self.plot_widget.scene().sigMouseMoved.connect(self.update)

    def update(self, pos):
        # 更新视口和坐标范围以适应缩放
        self.plot_item.vb.autoRange()

app = QtWidgets.QApplication(sys.argv)
main_window = PlotWindow()
main_window.show()
sys.exit(app.exec_())