[Webkit-unassigned] [Bug 40597] New: REGRESSION: input['type=radio'].focus() not redrawing background before drawing new frames

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=40597

           Summary: REGRESSION: input['type=radio'].focus() not redrawing
                    background before drawing new frames
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
               URL: http://beta.insightdining.com/surveys/barneys_beanery/
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: webkit at appsforartists.com


The linked page uses MooTools to tween both the instructions bar and the page scroll to the next focused input.  When the instructions bar tweens without causing a corresponding scroll, the glowing widget is being drawn incorrectly.  (See screenshot).

WebKit is tweening the glowing ring on the focused widget from alpha=0 to alpha=1.  The old frames are not being erased before new ones are being drawn.  So, instead of getting the 20% of the glow on the third frame, you're getting 20% + 10% + 0%.  As a result, the entire radius of the glow is at full opacity when the tween finishes.

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