[Bug]: Unable to resize undocked dev tools window in Electron 14 (Windows OS)

[rooklift]

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

14.0.0 (broken around v14.0.0-beta5)

Operating System Version

Windows 10 version 20H2

What arch are you using?

x64

Last Known Working Electron version

v14.0.0-beta3

Expected Behavior

Launch Electron itself. Open the dev tools. After undocking it, it should be resizable.

Actual Behavior

On Windows it is not resizable.

(Someone tells me that, if it was already undocked, they had to dock it and undock it again to see this effect.)

[samuelmaddock]

I'm able to reproduce the problem on Windows 10 21H1 build 19043.1165 using this Electron Fiddle gist: https://gist.github.com/d58e72108eae1935f73bbbc93f3b09d9

[rooklift]

Checking previous releases, I found that:

• It worked in v14.0.0-beta.3
• It was broken by v14.0.0-beta.5

I wasn't able to check beta4 since it didn't seem to have any assets. I've updated the top post.

[codebytere]

@rooklift yep, bisected it to that earlier today. I believe it's related to some changes around resizability that came through in a chromium roll and will keep digging.