[Webkit-unassigned] [Bug 167060] New: filter: drop-shadow rendering problem after animating

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=167060

            Bug ID: 167060
           Summary: filter: drop-shadow rendering problem after animating
    Classification: Unclassified
           Product: WebKit
           Version: Safari 10
          Hardware: Macintosh
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Animations
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mrsebastienleblanc at icloud.com
                CC: dino at apple.com

Created attachment 298866
  --> https://bugs.webkit.org/attachment.cgi?id=298866&action=review
Example of the bug

I have applied a fliter:drop-shadow to a transparent PNG image on hover.
When I add a transition to animate the propriety, the drop-shadow does not respect the css rule after the animation.
This is a bug and was fixed in Chrome with Blink r155623. 
I can prevent this by adding a transform: translateZ(0); but this is not an ideal solution.
See the attached vidéo for a more visual explanation.

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