QRangeSlider is not displayed correctly

[pascalzeugin]

Description
When enabling a stylesheet (https://pypi.org/project/pyqtdarktheme/) the QRangeSlider and all its derivatives are not rendered/displayed correctly.

To Reproduce
Steps to reproduce the behavior:

1. Install pyqtdarktheme version 1.1.0
2. Install qtpy
3. Install superqt
4. Execute minimal example

from qtpy.QtCore import Qt
from qtpy.QtWidgets import QApplication
from superqt import QRangeSlider
import qdarktheme

app = QApplication([])
app.setStyleSheet(qdarktheme.load_stylesheet())
slider = QRangeSlider(Qt.Orientation.Horizontal)
slider.setValue((20, 80))
slider.show()

app.exec_()

Expected behavior
Correct rendering of the widget

Desktop (please complete the following information):

• Win10
• PyQt5
• Python 3.9
  

[tlambert03]

yes, sorry this is a known issue, and a duplicate of issue #58

to keep things in one place, i'm going to close this issue and refer others to that one