Clash Royale CLAN TAG#URR8PPP

QPlainTextEdit shows text only if I select the text

I made a sample program with pyqt5 and python3, but there's a problem.
I appended text into QPlainTextEdit using QPlainTextEdit.appendPlainText, but the text I appended does not appear like there's some glitch in there.

and as soon as I select the whole text, It shows the text correctly.

I want to know if there's some glitch in MacOS pyqt implementation or I am doing exactly wrong thing.

Python 3.6

PyQt5 5.11.2

here's the code:

import sys
from PyQt5.QtWidgets import *


class MainWindow(QMainWindow):
toggle = False

def __init__(self):
super().__init__()
self.setWindowTitle("QMainWindow")
self.setGeometry(300, 300, 300, 400)

btn1 = QPushButton("Click me", self)
btn1.move(20, 20)
btn1.clicked.connect(self.btn1_clicked)

self.textEdit1 = QPlainTextEdit(self)
self.textEdit1.setGeometry(20, 60, 250, 300)

def btn1_clicked(self):
self.toggle = not self.toggle
self.textEdit1.appendPlainText("turned " + ("on" if self.toggle else "off"))


if __name__ == "__main__":
app = QApplication(sys.argv)
mainWindow = MainWindow()
mainWindow.show()
sys.exit(app.exec_())


By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.