RESOLVED MOVED265362
Element flickers when transitioning boxShadow with large spread value 
https://bugs.webkit.org/show_bug.cgi?id=265362
Summary Element flickers when transitioning boxShadow with large spread value
Ethan Wong
Reported 2023-11-26 22:15:00 PST
Created attachment 468761 [details] a page to reproduce the flickering issue Element flickers when transitioning `box-shadow` with a large spread value, see the attached html file and screen recording. This issue happens when the element has non-zero `border-radius` and non-integer `margin`s. It happens only on macOS 14. Force using using `PathRoundedRect::Strategy::PreferBezier` for `PathCG::addRoundedRect(const FloatRoundedRect&, PathRoundedRect::Strategy)` seems to work around this issue.
Attachments
a page to reproduce the flickering issue (724 bytes, text/html)
2023-11-26 22:15 PST, Ethan Wong 		no flags
Details
screen recording for the flickering issue (5.07 MB, video/quicktime)
2023-11-26 22:15 PST, Ethan Wong 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Ethan Wong
Comment 1 2023-11-26 22:15:34 PST
Created attachment 468762 [details] screen recording for the flickering issue
Radar WebKit Bug Importer
Comment 2 2023-11-27 10:35:27 PST
<rdar://problem/118840547>
Simon Fraser (smfr)
Comment 3 2023-11-27 10:36:46 PST
Thanks for the report. This is a bug in a system component below webkit.
Brent Fulgham
Comment 4 2023-12-21 15:07:06 PST
The actual work for this fix was done under <rdar://118793261>.
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