mozilla/pdf.js — pull request #4200 by timvandermeij (2014-01-26 20:25:05+00:00)
Title: Implemented mouse wheel behaviour for IE

Fixes #4118.

This patch implements the `mousewheel` event as used in Internet Explorer. This makes sure that using Ctrl+Scrollwheel only zooms the page in and out (instead of the whole viewer, just like in Firefox) and that scrolling in presentation mode will go to the next/previous page. Since presentation mode is only enabled in IE11, this will only affect IE11.