Prevent goofy scrolling effects in certain browsers.
Prevent goofy scrolling effects in certain browsers.

e.g., Chrome on OSX does an "elastic bump" type of animation when attempting to
scroll past the top or bottom of a document.  The effect is jarring when the
intent is for scrolling to accomplish a zoom, so we independently disable scroll
on the document itself, while reinstating it via callback on the SVG element.

Kitware/clique,Kitware/clique,Kitware/clique,XDATA-Year-3/clique,XDATA-Year-3/clique,XDATA-Year-3/clique