[Webkit-unassigned] [Bug 11650] New: REGRESSION: Incomplete repaint of style change when using smooth scrolling or scroll wheel in a frame

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=11650

           Summary: REGRESSION: Incomplete repaint of style change when
                    using smooth scrolling or scroll wheel in a frame
           Product: WebKit
           Version: 420+ (nightly)
          Platform: Macintosh
        OS/Version: Mac OS X 10.4
            Status: NEW
          Keywords: Regression
          Severity: Normal
          Priority: P1
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mitz at webkit.org


If smooth scrolling is enabled or a scroll wheel is used and an element changes
style during scrolling, it is not always repainted completely.

To reproduce:
1. In System Preferences > Appearance, select "Use smooth scrolling"
2. Open the test case
3. Scroll to the middle of the page and place the mouse pointer over the square
4. Click once to give keyboard focus to the frame
5. Use the up and down arrow keys to scroll the square out from under the mouse
and back in. You can also try using the scroll wheel to do that

Expected result:
The square should be painted with one solid color at all times, red when it is
under the mouse and green otherwise.

Actual results:
Occasionally the square is part green and part red.

Regression:
I couldn't reproduce in shipping Safari with this particular test case.


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