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

39.2.6

What operating system(s) are you using?

Windows

Operating System Version

10.0.26200.7462

What arch are you using?

x64

Last Known Working Electron version

38.2.2

Does the issue also appear in Chromium / Google Chrome?

I don't know how to test

Expected Behavior

We expect to be able to resize the window if "resizable: true" is set and this should not depend from the other options like "frame", "transparent", etc.

Actual Behavior

If we specify:

frame: false,
transparent: true,
resizable: true

in BrowserWindowConstructorOptions, the window can't be resized nor resize cursor appears.

Testcase Gist URL

https://gist.github.com/estoykov/5c0f777ce24df8c7c7a204d53ab732cc

Additional Information

May be with this PR #48499 if we create frameless, transparent window it can not be resized, even if we set "resizable: true" in constructor options.
You can use the provided gist to check with the latest stable Electrons and with 38.2.2.
It is just the standard Electron app with few options added:

const mainWindow = new BrowserWindow({
    width: 800,
    height: 600,
    transparent: true,
    frame: false,
    resizable: true,
    backgroundColor: "gray",
    webPreferences: {
      preload: path.join(__dirname, 'preload.js')
    }
  })