Bug 129691

Summary:

REGRESSION: Overlay scrollbars that have grown are sometimes askew in the track

Product:

WebKit

Reporter:

Beth Dakin <bdakin>

Component:

Layout and Rendering

Assignee:

Nobody <webkit-unassigned>

Status:

RESOLVED FIXED

Severity:

Normal

CC:

andersca, bdakin, cmarcelo, commit-queue, jamesr, luiz, simon.fraser, thorton, tonikitoo

Priority:

Keywords:

InRadar

Version:

528+ (Nightly build)

Hardware:

Unspecified

OS:

Unspecified

Attachments:

Description	Flags
Patch	simon.fraser: review+

Description Beth Dakin 2014-03-04 11:50:46 PST

Overlay scrollbars that have grown are sometimes askew in the track. This started happening after we adopted the setPresentationValue ScrollbarPainter API which allowed us to update the position of the scrollbar knob from our secondary scrolling thread. This bug occurs when the scrollbar grows while it still thinks it is in presentation-value mode. Whenever the scrollbar grows, it should be in non-presentation value mode.

<rdar://problem/15666846>

Comment 1 Beth Dakin 2014-03-04 12:00:12 PST

Created attachment 225801 [details]
Patch

Comment 2 Beth Dakin 2014-03-04 12:16:46 PST

Thanks, Simon! http://trac.webkit.org/changeset/165069