[Bug]: desktopCapturer thumbnails not respecting thumbnailSize, always low-res (29.3.2)

[Galkon]

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

29.3.2

What operating system are you using?

macOS

Operating System Version

Sonoma 14.4.1

What arch are you using?

arm64 (including Apple Silicon)

Last Known Working Electron version

28.3.1

Expected Behavior

Using the desktopCapturer API to capture a screen's thumbnail respects the thumbnailSize provided and when providing a thumbnailSize equivalent to the display width or height provides a full resolution thumbnail.

electron-28.3.1-working.mov

Actual Behavior

Instead, on 29.3.2, the thumbnail is always a low-resolution image scaled up to the specified thumbnailSize.

electron-29.3.2-broken.mov

Testcase Gist URL

https://gist.github.com/Galkon/18fcba517464f6c1f09d79ce083c898a

Additional Information

Appears to be fixed in 30.x and 31 alpha

[codebytere]

Duplicate of #41630