[Webkit-unassigned] [Bug 207586] New: CSS style 'filter: drop-shadow...' does not render correctly without repaint.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=207586

            Bug ID: 207586
           Summary: CSS style 'filter: drop-shadow...' does not render
                    correctly without repaint.
           Product: WebKit
           Version: Safari 13
          Hardware: Macintosh
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: CSS
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: andrewmcmurry at gmail.com

Created attachment 390427

  --> https://bugs.webkit.org/attachment.cgi?id=390427&action=review

Animated gif showing the issue.

the CSS style 'filter: drop-shadow...' does not render properly. On page load, the styles load and are applied as expected, but as we toggle visibility (this also happens when toggling display none/block), the drop-shadow effect isn't applied until you scroll or resize the window. To be specific, as you toggle the visibility on, there is no drop-shadow until you scroll or resize; as you toggle visibility off, the shadow remains until you scroll or resize.

Please see the issue here:
https://codepen.io/anon/pen/gNXvQX

Safari 12.0 - No Issue
Safari 12.1.1 - Broken
Safari 12.1.2 - Fixed
Safari 13.0.5 - Broken

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