[Bug]: Frameless window displays frame while opening

[samuelmaddock]

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-beta.25

What operating system are you using?

Windows

Operating System Version

Windows 10 21H1

What arch are you using?

x64

Last Known Working Electron version

14.0.0-beta.3

Expected Behavior

Opening a frameless window and immediately revealing it (instead of waiting for ready-to-show event) shows no content inside of the window.

Actual Behavior

Opening a frameless window and immediately revealing it (instead of waiting for ready-to-show event) shows an older style window frame with no content inside.

14.0.0-beta.3	14.0.0-beta.5

2021-08-30_18-21-42.mp4

Testcase Gist URL

https://gist.github.com/4256f388d41ef0d974645a11ab72b1fe

Additional Information

This may not be a bug, but I felt that displaying the frame while the window is opening was maybe not intentional.

[samuelmaddock]

Setting backgroundColor to #00000000 (alpha included) shows this until the window is resized:

[aleksey-hoffman]

I also noticed this issue. It's reproducible in v15.0.0-beta.1 as well

[mustafaabobakr]

Hi
Any news on this?

[codebytere]

Bisected to v14.0.0-beta.3...v14.0.0-beta.5

[mustafaabobakr]

@codebytere

Hi, am using v16.0.4 should I downgrade to v13 ?

[deepak1556]

Reopening for #33599

[deepak1556]

Although there is a user facing workaround, it is worth investigating why this code path regressed with the chromium roll bisected in this range #30760 (comment)

[Tarrowren]

I also noticed that the actual size of the window is a turn smaller than it looks. When dragging the scrollbar with the mouse you often accidentally click on the window zoom.

[infinnie]

I also noticed that the actual size of the window is a turn smaller than it looks. When dragging the scrollbar with the mouse you often accidentally click on the window zoom.

But it’s been so since at least Electron 13.x.

[rzhao271]

Bisected to 172ac25, though a lot of things happened during that roll: https://chromium.googlesource.com/chromium/src/+log/92.0.4511.0..93.0.4530.0?n=10000&pretty=fuller

[pushkin-]

@samuelmaddock Is this a dupe? Also, could your PR fix this issue?

[deepak1556]

@pushkin- #30024 is not a dupe although they share the same root cause of how the style WS_THICKFRAME presence impacts WS_CAPTION for frameless windows. Also, #35189 currently does not address it. It only tries to restore the behavior of frameless window which are resizable to how it was before the chromium roll #30760 (comment)