pyqt5加载pyvistqt绘制图像，设置背景色不生效

Describe the bug 继承FramelessWindow 主窗口加载显示pyvistqt的plotter，设置背景色为其他颜色，结果仍为白色；将主窗口继承QMainWindow, 设置plotter的背景色，生效。

Environment 环境信息

OS: Windows11
Python: 3.10
PyQt5: 5.15.10

Code 最小复现代码


import mne
import numpy as np
from mne.viz.backends import renderer
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import (
    QWidget,
    QVBoxLayout,
)

from qframelesswindow import FramelessWindow

class SegHeadWidget(QWidget):
    def __init__(self, renderer, parent=None):
        super().__init__()
        layout = QVBoxLayout()
        layout.addWidget(renderer)
        self.setLayout(layout)

class MainWindow(FramelessWindow):
    def __init__(self):
        super().__init__()

        self.widget = QWidget(self)

        self.seg_widget = self.load_seghead_image()

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

        self.widget.setLayout(layout)

    def load_seghead_image(self, data_man=None):
        coords = np.random.rand(100, 3)
        faces = np.random.randint(0, 100, (300, 3))

        self.renderer = renderer.create_3d_figure(size=(600, 600), bgcolor=(199, 19, 199), scene=False)
        gray = (0.3, 0.3, 0.3)
        self.renderer.mesh(*coords.T, triangles=faces, color=gray)

        view_kwargs = dict(elevation=90, azimuth=90)
        mne.viz.set_3d_view(figure=self.renderer.figure, distance=650, focalpoint=(0.0, 0.0, 40.0), **view_kwargs)

        self.plotter = self.renderer.plotter
        # self.plotter.set_background("red")
        self.plotter.interactor.set_background("green")
        self.plotter.update()
        self.plotter.updateGeometry()
        self.plotter._render()

        self.renderer_widget = SegHeadWidget(self.plotter)

        return self.renderer_widget

if __name__ == "__main__":
    import sys
    from qtpy.QtWidgets import QApplication

    app = QApplication(sys.argv)

    window = MainWindow()
    window.show()

    sys.exit(app.exec_())

左侧是继承QMainWindow，右侧是继承FramelessWindow

zhiyiYo / PyQt-Frameless-Window

pyqt5加载pyvistqt绘制图像，设置背景色不生效 #157