[Webkit-unassigned] [Bug 98825] New: Adjusting CSS left property on element with border-radius leaves repaint trail

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=98825

           Summary: Adjusting CSS left property on element with
                    border-radius leaves repaint trail
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.8
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: dbates at webkit.org


Created an attachment (id=167856)
 --> (https://bugs.webkit.org/attachment.cgi?id=167856&action=review)
Example

Using Safari Mac Nightly r130772 with Safari version Version 6.0.1 (8536.26.14) on Mac Adjusting the CSS left property of an element with a non-zero border-radius may leave a noticeable repaint trail. You can observe this issue by using the attached example, example.html, and performing the following steps:

1. Open example.html.
2. Click the blue square 10 times.

Notice that the left edge of the blue square is painted multiple times from the left edge of the window to its current position.
Once you become familiar with the issue you may find that you can reproduce it by clicking the blue square less than 10 times.

For completeness, I was able to reproduce this issue with Mac Nightly r130772 and Safari version 6.0.1 (8536.26.14) on Mac OS 10.8.2.

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