[Webkit-unassigned] [Bug 45631] scrollByLines() is now asynchronous on Windows

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=45631





--- Comment #5 from Darin Fisher (:fishd, Google) <fishd at chromium.org>  2010-09-23 14:50:25 PST ---
(In reply to comment #0)
> Created an attachment (id=67356)
 --> (https://bugs.webkit.org/attachment.cgi?id=67356) [details]
> test for behaviour change 2)
> 
> Patch http://trac.webkit.org/changeset/67001/ introduced smooth scrolling on Windows, which changes two behaviours:
>  1) the scroll event triggered by scrollByLines() is no longer fired synchronously; 
>  2) the value of scrollTop is not synchronously set to the target value

3) a single scroll action may result in multiple scroll events

i wonder if this third artifact isn't the cause of bugs like:
http://code.google.com/p/chromium/issues/detail?id=55218

The HTML5 spec does not document the behavior of the 'scroll' event.  I recall a whatwg (or public-webapps) thread where it was asserted that the 'scroll' event should be dispatch asynchronously.

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