[Webkit-unassigned] [Bug 52988] REGRESSION (r75555): Safari RSS sidebar jiggles when scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=52988





--- Comment #14 from mitz at webkit.org  2011-01-24 15:52:25 PST ---
>From an API standpint, the “asynchronous” nature of scroll events only really manifests itself in programmatic scrolling, i.e. in whether a the scroll event handler is entered before the script that modified the scroll position returned. r75555 decoupled the scroll event dispatch from the scrolling in order to satisfy this asynchronicity requirement, which introduced some issues. I think we should instead consider something else that will satisfy the requirement, which is to make “scrolling” itself decoupled from setting the scroll position by script. What I’m proposing is that setting scrollX, scrollY etc. (or calling scrollTo, scrollBy) will not scroll synchrnously (and thus not trigger a repaint), but just enqueue the scrolling for after return from script. Of course, the DOM will report the new scroll position when asked. It’s just committing to the ScrollView (or RenderLayer), and the subsequent scroll events, that would be deferred.

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