Subject: bug#42406: Mouse-wheel scrolling can be flickering

From: Konrad Podczeck <[email-masked]>
Date: Sun, 19 Jul 2020 22:29:20 +0200

For me, there is no difference with Emacs 28. To see this best, make the following customizations:

(setq mouse-wheel-progressive-speed nil)
(setq mouse-wheel-scroll-amount '(1 ((shift) . 1)))

(and make sure that in the Mouse Options part of the Accessibilty panel of the general System Preferences of MacOS, scrolling with inertia is enabled.)

> Am 19.07.2020 um 15:33 schrieb Alan Third <[email-masked]>:
> 
> On Fri, Jul 17, 2020 at 05:36:10PM +0200, Konrad Podczeck wrote:
>> Mouse-wheel scroll and then suddenly release the mouse-wheel, so
>> that thereafter the text scrolled still moves for a short time.
>> During that time, the text flickers.
>> 
>> (In case this is platform-dependent, I use the NS-port of Emacs
>> 27.0.91/pretest)
> 
> Emacs 28 will use a different method of drawing to the screen that
> should, hopefully, not flicker. Can you please try out a build from
> master and see if it's any better?
> -- 
> Alan Third