Subject: Re: bug#40278: 27.0.90; Flickering in Windows 10

From: martin rudalics <[email-masked]>
Date: Wed, 1 Apr 2020 08:36:15 +0200

> Emacs frame partially covered by an Emacs frame: Nothing happens. Mouse input
 > does not seem to go anywhere.

Might be that here I'm using yet another program to handle that case.
'mouse-wheel-follow-mouse' should not be involved but please make sure
that it's t.

 > Emacs frame partially covered by a Windows explorer window: Emacs scrolls
 > normally, that is, in my case there is some flickering. But nothing like what
 > happens with a child frame.

 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?

martin