[PyQt] Huge text under macOS as soon as QGLWidget is used?

[Elvis Stansvik]

Hi all,

(This may not be PyQt-specific.)

I was debugging a problem with huge text when mixing PyQt and VTK.

Minimal test case:

import sys

from PyQt5.QtWidgets import QApplication, QMainWindow, \
        QPushButton, QVBoxLayout, QWidget
from PyQt5.QtOpenGL import QGLWidget

app = QApplication(sys.argv)

# Case 1: No QGLWidget
win1 = QMainWindow()
widget1 = QWidget()
layout1 = QVBoxLayout()
layout1.addWidget(QPushButton('Hello 1'))
widget1.setLayout(layout1)
win1.setCentralWidget(widget1)
win1.show()

# Case 2: QGLWidget
win2 = QMainWindow()
widget2 = QWidget()
layout2 = QVBoxLayout()
layout2.addWidget(QPushButton('Hello 2'))
layout2.addWidget(QGLWidget())
widget2.setLayout(layout2)
win2.setCentralWidget(widget2)
win2.show()

exit(app.exec_())

See attached screenshot for result (using latest PyQt wheel from PyPI).

How come in the second main window, the QPushButton has become huge,
just because a QGLWidget was added. Anyone know?

Many thanks in advance,
Elvis
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