[Webkit-unassigned] [Bug 239272] New: The first frame of an animation GIF is sometimes skipped on GTKWebKit and WinCairo

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=239272

            Bug ID: 239272
           Summary: The first frame of an animation GIF is sometimes
                    skipped on GTKWebKit and WinCairo
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: yuki.sekiguchi at access-company.com
                CC: sabouhallawa at apple.com

Created attachment 457503

  --> https://bugs.webkit.org/attachment.cgi?id=457503&action=review

reproduced content

How to reproduce:
1. Load the attached test.gif
2. See the first frame isn't 3 white boxes

Description:
The first frame of test.gif is 3 white boxes. This should be shown. However, GTKWebKit and WinCairo sometimes show the 2nd frame, which has a black block at the right, or the 3rd frame, which has a black block at the center.

Chrome for Linux and Firefox for Linux shows the 1st frame.
Safari and WebKit nightly shows the 1st frame.

I tested r292705.

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