[Webkit-unassigned] [Bug 17501] New: Horizontal scroll bar drawing glitch: becomes detached from bottom

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=17501

           Summary: Horizontal scroll bar drawing glitch: becomes detached
                    from bottom
           Product: WebKit
           Version: 525+ (Nightly build)
          Platform: Macintosh
               URL: http://sports.yahoo.com/
        OS/Version: Mac OS X 10.4
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: opendarwin at lapcatsoftware.com


Overview Description:
On <http://sports.yahoo.com/> and sub-pages, there are horizontal scrollbar
glitches, where a scrollbar is drawn at the bottom of the page (perhaps
unnecessarily), and then when you scroll down in the page, the scrollbar
becomes detached from the bottom and appears in the middle of the page content.

Steps to Reproduce:
(1) Launch Safari 3.
(2) Empty cache.
(3) Open http://sports.yahoo.com/
(4) At the top, click on "Tennis".
(5) Scroll down the page.

Actual Results:
The scrollbar becomes detached from the bottom of the window, appearing in the
middle of the page content and moving up as you scroll down.

Expected Results:
A scrollbar should not appear in the middle of the page content.

Build Date & Platform:
Safari Version 3.0.4 (523.12.2) on Mac OS X 10.4.11 (Build 8S2167).

Additional Builds and Platforms:
WebKit revision 30511 built from source and using the run-safari script.

Additional Information:
The appearance of the visual glitch seems to depend very much on the window
size.  If the window is too small, it will not appear.  Also, the glitch may
not appear when loading the page subsequent times, so you may need to empty the
cache to reproduce.

I've attached three screenshots.  The file yahoo1.jpg shows the page after you
first load, with the scrollbar on the bottom.  The file yahoo2.jpg shows the
page after scrolling down, and you can see that the scrollbar has moved up. 
The file yahoo-TOT.tiff shows a visual glitch with extraneous scrollbar
widgets; you can see them on the right side of the screen between the game
scores and the vertical scroller.


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