Bug 227478

Summary:

[css-scroll-snap] Triggering a layout during scroll causes jittery scrolling on Mac when dragging the scrollbar

Product:

WebKit

Reporter:

Martin Robinson <mrobinson>

Component:

Scrolling

Assignee:

Martin Robinson <mrobinson>

Status:

RESOLVED FIXED

Severity:

Normal

CC:

simon.fraser, webkit-bug-importer

Priority:

Keywords:

InRadar

Version:

Safari Technology Preview

Hardware:

Unspecified

OS:

Unspecified

See Also:

https://bugs.webkit.org/show_bug.cgi?id=173887
https://bugs.webkit.org/show_bug.cgi?id=228572

Attachments:

Description	Flags
Test case	none
Patch	none
Patch	none
Patch	none

Martin Robinson

Reported 2021-06-29 01:47:36 PDT

When a page trigger layout during scroll events and with scroll snap, dragging the scrollbar on a Mac causes a lot of jitter while scrolling. The issue is that during layout the code is trying to snap. Each new movement of the scroll bar unsnaps briefly and then the relayout snaps again.

Attachments
Test case (1.15 KB, text/html) 2021-06-29 01:48 PDT, Martin Robinson	no flags	Details
Patch (13.44 KB, patch) 2021-07-01 04:36 PDT, Martin Robinson	no flags	Details Formatted Diff Diff
Patch (14.47 KB, patch) 2021-07-02 03:25 PDT, Martin Robinson	no flags	Details Formatted Diff Diff
Patch (14.42 KB, patch) 2021-07-05 01:32 PDT, Martin Robinson	no flags	Details Formatted Diff Diff
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