Bug 207687

Summary:

scrollTop change in pointermove event results flickering

Product:

WebKit

Reporter:

Roland Soos <roland>

Component:

Scrolling

Assignee:

Nobody <webkit-unassigned>

Status:

NEW ---

Severity:

Normal

CC:

graouts, simon.fraser, thorton, webkit-bug-importer, zalan

Priority:

Keywords:

InRadar

Version:

Safari 13

Hardware:

All

OS:

All

Attachments:

Description	Flags
Test case	none
Screen record	none

Description Roland Soos 2020-02-13 04:37:27 PST

Created attachment 390628 [details]
Test case

Steps to reproduce:
#1 Open https://smartslider3.com/bugs/webkit/pointerscroll/
#2 hold the pointer down and move it up or down

What should happen?
The pointer movement should move the scroll up and down

What went wrong?
During the scrollTop change the screen starts to flicker

Comment 1 Roland Soos 2020-02-13 04:38:05 PST

Created attachment 390629 [details]
Screen record

Comment 2 Radar WebKit Bug Importer 2020-02-16 18:07:52 PST

<rdar://problem/59498307>

Comment 3 Simon Fraser (smfr) 2020-02-17 10:39:01 PST

I can reproduce. Is it better if you use touch events?

Comment 4 Roland Soos 2020-02-17 23:40:29 PST

Simon: It is a little bit better, but from user perspective it is as worse as with the pointer events. The only difference that the Safari top and bottom UI is not flickering.

https://smartslider3.com/bugs/webkit/pointerscroll/touch.html