WindowStyle=None 后窗体变成了直角，阴影也没有了

[hacker-frok]

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Describe the bug

WindowStyle=None 后窗体变成了直角，阴影也没有了

Steps to reproduce the bug

1.WindowStyle=None 2.窗体变成了直角，窗体阴影丢失，无法添加阴影

Expected behavior

No response

Screenshots

预期的效果是这样的： 实际是这样的：

NuGet package version

None

IDE

No response

Framework type

No response

Windows version

No response

Additional context

No response