[Webkit-unassigned] [Bug 11969] New: REGRESSION: hovered text elements are incorrectly clipped when scrolling

[bugzilla-daemon at webkit.org]

http://bugs.webkit.org/show_bug.cgi?id=11969

           Summary: REGRESSION: hovered text elements are incorrectly
                    clipped when scrolling
           Product: WebKit
           Version: 420+ (nightly)
          Platform: Macintosh
        OS/Version: Mac OS X 10.4
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: New Bugs
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: Hanspeterschaub at mac.com


I found that with the latest nightly builds over the last week that my CSS
based dynamic menus disappear if I scroll the page some.  I've created a test
html page to illustrated this.  When the page loads, the menus behave
correctly.  The menus are created using <ul> and CSS styling to hide the
sub-menus.  When you hover over the <li> element, then the sub-menus appear.  

After the page loads the menus work as expected.  When moving the mouse over
the menu item, the sub-menus appear.  However, if you scroll up a little, then
you find that the lower sub-menus begin to be clipped?  If you scroll too much,
then the entire sub-menu is clipped and is invisible.  It must still be at the
correct location because the links in the sub-menus are still active.  You just
can't see the submenu?

The z-index is set to 100 to make sure the sub-menus should always be drawn
above the text.  With the latest builds some draw clipping error appears to
have crept in.


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