Strange QComboBox item height behaviour on MacOS

[donquibeats]

I'm having problems with item heights in QComboBox widgets on MacOS. For the purpose of testing, I've got this little chunk of code:

        self.layout = QGridLayout(self)
        self.testComboBox = QComboBox()
        for n in range(1, 11):
            self.testComboBox.addItem("Item " + str(n))
        self.layout.addWidget(self.testComboBox, 0, 0)

On Windows 10, all is fine, and it's looking like this:

However the exact same code on a Mac is giving me this:

Please can someone explain why the first item is so much taller on MacOS and how I'm supposed to set the QComboBox so that the items are consistent heights cross-platform?

[SGaist]

Hi,

What are you using ? PySide2 or PyQt5 ?
What version ?
How did you install it ?
What version of macOS ?
Can you profile a complete minimal sample that reproduces this ?

[donquibeats]

Apologies for the lack of information in the original post. It's a PyQt5 project.

In trying to create a standalone reproduction of the problem, I was able to narrow down where the problem lies. It appears to be an issue with the QDarkStyle stylesheet that I'm using. If I comment out the setStyleSheet line, then it works as expected on both platforms- but with the stylesheet applied, it looks fine on Windows but has the aforementioned variable-height issue on Mac.

Here's a standalone bit of code:

import sys
from PyQt5.QtWidgets import QApplication, QGridLayout, QComboBox, QFrame, QDialog, QVBoxLayout
import qdarkstyle


class App(QDialog):
    def __init__(self):
        super().__init__()
        self.title = 'PyQt5 test window'
        self.layout = QVBoxLayout(self)

        self.testComboBox = QComboBox()
        for n in range(1, 11):
            self.testComboBox.addItem("Item " + str(n))

        self.innerGrid = QGridLayout()
        self.innerGrid.addWidget(self.testComboBox, 0, 0)
        self.testComboBox_frame = QFrame()
        self.testComboBox_frame.setLayout(self.innerGrid)

        self.layout.addWidget(self.testComboBox_frame)
        self.initUI()

    def initUI(self):
        self.setWindowTitle(self.title)
        self.show()


if __name__ == '__main__':
    app = QApplication(sys.argv)
    app.setStyleSheet(qdarkstyle.load_stylesheet_pyqt5())
    ex = App()
    sys.exit(app.exec_())

[SGaist]

Can you also provide that QDarkStyle ?

[donquibeats]

QDarkStyle is available from PyPi here: https://pypi.org/project/QDarkStyle/

In my project it is installed automatically as part of the requirements.txt file.

If this isn't enough information, please let me know.