[Webkit-unassigned] [Bug 93160] New: Changing opacity with -webkit-transition can cause layers to flicker

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=93160

           Summary: Changing opacity with -webkit-transition can cause
                    layers to flicker
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
               URL: https://www.facebook.com/facebook
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: ide+webkit at fb.com
                CC: browser-bugs at fb.com


Setup: Safari 6.0 (8536.25) on OS X 10.8

Repro steps:
 - Launch Safari 6 and expand the viewport to be greater than 2000 pixels wide (e.g. with window.resizeTo(2001, 1000)). Height does not seem to matter.
 - Visit https://www.facebook.com/facebook
 - Click the Facebook logo to open the photo viewer
 - Mouse in and out between the image and the lightbox background. There is a flicker.

Disabling the -webkit-transition styles on ".fbPhotoSnowlift .snowliftPager" and ".fbPhotoSnowlift .snowliftOverlay" removes the flicker.

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