[Webkit-unassigned] [Bug 79249] New: With tiled drawing enabled, pressing Down arrow after scrolling via mouse gesture causes page to jump back up to top

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=79249

           Summary: With tiled drawing enabled, pressing Down arrow after
                    scrolling via mouse gesture causes page to jump back
                    up to top
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.7
            Status: NEW
          Keywords: PlatformOnly
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: aroben at apple.com
                CC: andersca at apple.com,
                    webkit-bug-importer at group.apple.com


To reproduce:

0. Enable tiled drawing
1. Go to http://www.webkit.org/blog/
2. Scroll down a bit using a 1-finger swipe on a Magic Mouse (I haven't tested other mice)
3. Press the Down arrow

The page jumps back up to the top, then scrolls down one "arrow's worth". It's as if there are two different scroll offsets being tracked: one for gesture scrolls, and one for keyboard scrolls.

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