[Bug]: 无边框对话框打开的一瞬间会显示最大，最小，关闭按钮

[runningsnai1]

What happened?

无边框对话框打开的一瞬间会显示最大，最小，关闭按钮，然后再消失

Operation System

windows10

Python Version

3.10.7-64bit

PyQt/PySide Version

pyside6.6.2

PyQt/PySide-Fluent-Widgets Version

1.5.3

How to Reproduce?

点击按钮，弹出无边框对话框

Minimum code

# coding:utf-8
import sys
from PySide6.QtWidgets import QApplication, QWidget

from qfluentwidgets import Dialog, PrimaryPushButton


class Demo(QWidget):

    def __init__(self, parent=None):
        super().__init__(parent=parent)
        self.resize(950, 500)
        self.btn = PrimaryPushButton('Click Me', parent=self)
        self.btn.move(425, 225)
        self.btn.clicked.connect(self.showDialog)
        self.setStyleSheet('Demo{background:white}')

    def showDialog(self):
        title = 'Are you sure you want to delete the folder?'
        content = """If you delete the "Music" folder from the list, the folder will no longer appear in the list, but will not be deleted."""
        w = Dialog(title, content, self)
        if w.exec():
            print('Yes button is pressed')
        else:
            print('Cancel button is pressed')


if __name__ == '__main__':
    app = QApplication(sys.argv)
    w = Demo()
    w.show()
    app.exec()

[AlexZhu2001]

无法复现，相同代码运行正常

[runningsnai1]

bandicam.2024-04-19.21-39-15-348.mp4

我这里看很明显。。

[AlexZhu2001]

确实有，但是FramelessDialog也会有，建议转移该问题到PyQt-Frameless-Window仓库

[AlexZhu2001]

但是这个问题应该不影响使用。目前只发现在Windows上能复现，并且在我的环境下必须快速使用Esc关闭对话框才能看到。
应该是和Windows上无边框窗口的实现方式有关的。Windows上无边框窗口是使用FramelessWindowHint + Windows native的flag + WM_NCCALCSIZE 实现的，可能和这些有关，如果不实现WM_NCCALCSIZE就会显示原生的标题栏，也许是Python太慢了？

[XiaoYouChR]

原因是 Qt 窗口加载完毕后才开始处理 nativeEvent