[Bug 1228250]

[R-bugs-h]

(In reply to Masayuki Nakano (:masayuki) (Mozilla Japan) from comment #82) 
> > That sounds like a minor problem that could be fixed in this bug or a
> > follow-up.
> 
> I think that we should decide it in this bug. Smaug, how do you think? I
> believe that if we'd swap deltaX/deltaY for default action, DOM wheel event
> and legacy mouse scroll events should represent it. However, if we do so in
> default settings, there is an issue mentioned in #4 (below).

Doesn't sound like a minor problem.
Since widgets on web pages tend to emulate native scrollable areas, they should get events similar to
native viewport or other scrollable areas.

#4 is tricky, but I think we should favor the more common case, so swap. 
How does IE handle this? What does Chrome actually report in delta values?

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https://bugs.launchpad.net/bugs/1228250

Title:
  [Shift + Mouse-Scroll-Wheel] Does NOT Scroll Horizontally

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