Bug 207687

Summary: scrollTop change in pointermove event results flickering
Product: WebKit Reporter: Roland Soos <roland>
Component: ScrollingAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal CC: graouts, simon.fraser, thorton, webkit-bug-importer, zalan
Priority: P2 Keywords: InRadar
Version: Safari 13   
Hardware: All   
OS: All   
Attachments:
Description Flags
Test case
none
Screen record none

Roland Soos
Reported 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
Attachments
Test case (1.24 KB, text/html)
2020-02-13 04:37 PST, Roland Soos 		no flags
Details
Screen record (1.82 MB, video/mp4)
2020-02-13 04:38 PST, Roland Soos 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Roland Soos
Comment 1 2020-02-13 04:38:05 PST
Created attachment 390629 [details] Screen record
Radar WebKit Bug Importer
Comment 2 2020-02-16 18:07:52 PST
<rdar://problem/59498307>
Simon Fraser (smfr)
Comment 3 2020-02-17 10:39:01 PST
I can reproduce. Is it better if you use touch events?
Roland Soos
Comment 4 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
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