[Bug]: set "transparent" to true and "titleBarStyle” to "hidden", a title bar is shown when window loses focus, "backgroundMaterial" not work until resizing the window. #39959
Description
Preflight Checklist
- I have read the Contributing Guidelines for this project.
- I agree to follow the Code of Conduct that this project adheres to.
- I have searched the issue tracker for a bug report that matches the one I want to file, without success.
Electron Version
27.0.0-beta.5
What operating system are you using?
Windows
Operating System Version
Windows 11 - 22H2
What arch are you using?
x64
Last Known Working Electron version
No response
Expected Behavior
1、The window should show without a title bar.
2、The window should be transparent and backgrounds should be "acrylic" style.
Actual Behavior
1、window background not transparent and not "acrylic" style until I resize the window.
after resize the window:
2、If the window loses focus, a title bar is shown and it can't interact.
Testcase Gist URL
https://gist.github.com/d51806da56e0f6103859d0164b22a80a
Additional Information
No response