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See also [https://bugzilla.mozilla.org/show_bug.cgi?id=513817 bug 513817].
= Limitation of scroll amount =
Even if nsMouseScroll event has larger delta than the target frame size, Gecko scrolls it just one page because if some lines are skipped, the user may not find existing of the lines. This is especially serious problem on listbox.
This limitation is computed when the scrolling is executed, so, the DOMMouseScroll event has original delta value.
= Hack for Thinkpad Trackpoint scrolling (Windows)=
