Bug 216679

Summary: Corrupted rendering behavior on GitHub
Product: WebKit Reporter: Marcos Caceres <marcos>
Component: ScrollingAssignee: Simon Fraser (smfr) <simon.fraser>
Status: RESOLVED WORKSFORME    
Severity: Normal CC: bfulgham, simon.fraser, webkit-bug-importer, zalan
Priority: P2 Keywords: InRadar
Version: Safari Technology Preview   
Hardware: Mac   
OS: macOS 10.15   
Attachments:
Description Flags
Video showing rendering error none

Description Marcos Caceres 2020-09-17 19:30:35 PDT
Created attachment 409100 [details]
Video showing rendering error

(Safari 14 + STP)

Steps to reproduce: 
  1. Visit any open pull request on GitHub
  2. Click on "files"
  3. Scroll until header snaps
  4. Either scroll up/down to see rendering defect or keep scrolling... it randomly occurs (see attached video).
Comment 1 Alexey Proskuryakov 2020-09-19 11:53:01 PDT
> (Safari 14 + STP)

Did this affect earlier versions too?
Comment 2 Radar WebKit Bug Importer 2020-09-21 11:48:07 PDT
<rdar://problem/69317429>
Comment 3 Marcos Caceres 2020-09-21 11:59:10 PDT
(In reply to Alexey Proskuryakov from comment #1)
> > (Safari 14 + STP)
> 
> Did this affect earlier versions too?

Not that I’ve seen. I’ve been using Safari daily on GitHub for years.
Comment 4 Simon Fraser (smfr) 2020-09-22 14:30:32 PDT
I can reproduce, but it's not quite as obvious as the video recording. Stretched layer contents is almost always a bug (unless the content is doing scale transforms).
Comment 5 Marcos Caceres 2021-08-16 02:00:59 PDT
Seems this got fixed at some point.