[Python] PyQtDarkTheme: Check‑mark missing for current item in QComboBox popup

I'm using PyQt6 with PyQtDarkTheme and have encountered a UI issue:
When opening a QComboBox popup, the currently selected item doesn't show the usual ✔ checkmark, or it's so low-contrast that it's effectively invisible. This works correctly without PyQtDarkTheme, so it seems to be theme-related.

How can I fix this so that the dropdown clearly displays the checkmark for the selected item, even with PyQtDarkTheme applied?

Without PyQtDarkTheme (check-mark visible) With PyQtDarkTheme (check-mark missing)

Minimal reproducible example


# pip install pyqt6 qdarktheme
import sys
import qdarktheme
from PyQt6.QtWidgets import QApplication, QWidget, QVBoxLayout, QComboBox

class Demo(QWidget):
def __init__(self):
super().__init__()

combo = QComboBox()
combo.addItems(["First option", "Second option", "Third option"])

layout = QVBoxLayout(self)
layout.addWidget(combo)

self.setWindowTitle("PyQtDarkTheme – invisible check‑mark")

if __name__ == "__main__":
app = QApplication(sys.argv)
app.setStyleSheet(qdarktheme.load_stylesheet("auto")) # Apply dark theme
w = Demo()
w.resize(250, 80)
w.show()
sys.exit(app.exec())

Environment:

• Python 3.11
• PyQt6 6.8
• PyQtDarkTheme 2.1
• macOS 15

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