bug#40278: 27.0.90; Flickering in Windows 10

[Nicolas Bértolo]

>  From what Noam described the flickering could be due to the tool bar.
> What happens when you write
>
> (defun open-test ()
>    (display-buffer-in-child-frame
>     (get-buffer-create "test child-frame")
>     '((child-frame-parameters . ((tool-bar-lines . 0)
>                                 (width . 20)
>                                  (height . 10)
>                                  (top . 200)
>                                  (left . 100))))))
>
> instead?

No difference here.

> At any rate, if I've understood the responses from Eli, it sounds like
> there isn't any bug here, just that we haven't implemented double
> buffering for Windows.

This may be the reason indeed.