[Webkit-unassigned] [Bug 42949] New: rendering issues with latest Webkit

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=42949

           Summary: rendering issues with latest Webkit
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Tables
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: chromium at hybridsource.org


Rendering issues in latest Webkit were discovered when visiting Chromium's bug tracker at http://code.google.com/p/chromium/issues/detail?id=30101 and scrolling around.  Specifically, I scrolled to the bottom of the page and then hit the right-arrow key to scroll all the way to the right, then the left-arrow key to scroll back to the left.  This left a white line through the text on the left, as shown in the left part of the attached image.  Also, if I scroll up very quickly, text is cut off, as shown in the right part of the attached image.  Both artifacts are reset back to normal if I then move the page slightly up or down to trigger a repaint.  This was first discovered in Chromium running on FreeBSD and using WebKit 534.3-63992, then someone else confirmed on Windows 7 with Chromium using the same Webkit version.  I also tried it with latest Safari 5.0 using WebKit 533.16 on Windows XP and wasn't able to reproduce, but was able to reproduce on the same machine if I ran th
 e Webkit nightly 63957.  This implies that this rendering bug snuck in somewhere between 533.16 and HEAD.

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