Propagate mousewheel event if ctrl key is pressed. #331
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Typical browser behaviour allow us to zoom the page in/out by mouse wheel with control key pressed. It would be better if this behaviour still the same (Issue #319).
My change have been made and tested with Windows PC in Chrome and IE. I thought about Macs and I tried to test it on OS X Yosemite but it has no zoom feature by mousewheel at all. I googled how it can be enabled and found the following topic http://forums.macrumors.com/threads/zoom-with-control-mouse-wheel.1411306/ But after enabling "Use scroll gesture with..." nothing has changed and I decided to leave it as it is. By the way, jQuery.mousewheel event has no property commandKey and it should be determined by keyCode :)