[Bug]: App hijacks focus from win.previewFile since v12.0.9

[EtienneLem]

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 feature request that matches the one I want to file, without success.

Electron Version

12.0.9

What operating system are you using?

macOS

Operating System Version

macOS Big Sur 11.4

What arch are you using?

arm64 (including Apple Silicon)

Last Known Working Electron version

12.0.8

Expected Behavior

When using win.previewFile, it is expected that pressing spacebar or escape would dismiss the preview window.

Actual Behavior

Nothing happens, or rather your app is still receiving the shortcuts and the preview window is not.

Testcase Gist URL

No response

Additional Information

Given the very small v12.0.9 update, it would be safe to assume that #29235 is responsible for this regression.

Not sure if relevant, but:

Before
When calling win.previewFile it used to trigger a blur followed by an immediate focus event on window:

Now
When calling win.previewFile it triggers this pair of events 4 times in a row:

[nornagon]

#29235 looks like a possible culprit. cc @deepak1556