bug: Window transparency does not work

[Ggeshechka]

Duplicate Check

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Describe the bug

By rounding the window, the color of the system window is visible, but if you make it transparent, it does not work as described in the documentation.

Code sample

Code

page.window.bgcolor = Colors.TRANSPARENT
page.bgcolor = Colors.TRANSPARENT

To reproduce

1. Launching a window with system window transparency settings

Expected behavior

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Screenshots / Videos

Captures

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Operating System

Linux

Operating system details

Ubuntu 24.04

Flet version

0.70.0.dev6425

Regression

Yes, it used to work in a previous Flet version (please specify the version in additional details)

Suggestions

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Logs

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Additional details

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