Comment #8 on issue 207 by heue...@gmail.com: Horizontal scrolling causes an exception
http://code.google.com/p/piccolo2d/issues/detail?id=207

+1 to ignoring these events for now instead of throwing an exception for the release-1.3 branch.

A comment in the Sun bug above describes a workaround for OSX

"Apple have added a workaround for this in Radar #4631846 - horizontal scrolling creates a MouseWheelEvent with the "Shift" modifier set. This is a much lower impact method than that specified above and works quite well. Any chance it could be extended across platform?"

For svn trunk I think Piccolo2D should forward on events to the best of its ability, and add support to e.g. PInputEvent for these platform-specific workarounds, in case clients wish to implement horizontal scrolling on their own.

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