Bug 217987 - REGRESSION (r268483): Map jumps around while zooming on windy.com, strava.com
Summary: REGRESSION (r268483): Map jumps around while zooming on windy.com, strava.com
Alias: None
Product: WebKit
Classification: Unclassified
Component: Animations (show other bugs)
Version: WebKit Nightly Build
Hardware: Unspecified Unspecified
: P2 Normal
Assignee: Antoine Quint
Keywords: InRadar
Depends on:
Reported: 2020-10-20 14:11 PDT by Antoine Quint
Modified: 2020-10-20 17:45 PDT (History)
3 users (show)

See Also:

Test (388 bytes, text/html)
2020-10-20 14:13 PDT, Antoine Quint
no flags Details
Patch (9.22 KB, patch)
2020-10-20 14:38 PDT, Antoine Quint
simon.fraser: review+
ews-feeder: commit-queue-
Details | Formatted Diff | Diff

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Description Antoine Quint 2020-10-20 14:11:20 PDT
Load windy.com, and zoom the map in and out with up/down scroll gestures on the trackpad. The map jumps around, seemingly using the wrong zoom origin.
Comment 1 Antoine Quint 2020-10-20 14:11:42 PDT
Comment 2 Antoine Quint 2020-10-20 14:13:17 PDT
Created attachment 411914 [details]

The issue is that when several animations for the same property targeting the same layer are added at the same time, we used to always override the previous animations and now, for transform animations, we actually use additivity over the previous animations.
Comment 3 Antoine Quint 2020-10-20 14:38:47 PDT
Created attachment 411917 [details]
Comment 4 Simon Fraser (smfr) 2020-10-20 14:41:21 PDT
Comment on attachment 411917 [details]

View in context: https://bugs.webkit.org/attachment.cgi?id=411917&action=review

> Source/WebCore/platform/graphics/ca/GraphicsLayerCA.cpp:2960
> +            // animations created for a single KeyframeEffect, one for each trasnform component. In that

Comment 5 Antoine Quint 2020-10-20 15:58:56 PDT
Committed r268771: <https://trac.webkit.org/changeset/268771>