[Python] Copy selected text from PDF in PyQt5 QWebEngineView

I use PyQt5.QtWebEngineWidgets to display a PDF and I'm trying to get the selected text. Using hasSelection() and selectedText() works on HTML files, but it fails when the web view displays a PDF file. Any idea how to copy the selected text (apart from using CTRL+C)?

from PyQt5.QtCore import QUrl
from PyQt5.QtWidgets import QApplication, QMainWindow, QWidget, QMenu
from PyQt5.QtWebEngineWidgets import QWebEngineSettings, QWebEngineView

class Browser(QWebEngineView):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)

def get_selection(self):
if self.hasSelection():
print(self.selectedText())
else:
print('No text selected')

def contextMenuEvent(self, event):
self.menu = QMenu()
get_selection = self.menu.addAction('Copy')
get_selection.triggered.connect(self.get_selection)
self.menu.popup(event.globalPos())

class MainWindow(QMainWindow):
def __init__(self):
super(QMainWindow, self).__init__()
self.setWindowTitle("PDF Viewer")
self.setGeometry(0, 28, 1000, 750)
self.webView = QWebEngineView()
self.webView = Browser()
self.webView.settings().setAttribute(QWebEngineSettings.PluginsEnabled, True)
self.webView.settings().setAttribute(QWebEngineSettings.PdfViewerEnabled, True)
self.setCentralWidget(self.webView)

if __name__ == '__main__':

import sys
app = QApplication(sys.argv)
win = MainWindow()
win.show()
win.webView.setUrl(QUrl.fromLocalFile("d:/test.pdf"))
sys.exit(app.exec_())

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