behavior-user-select.js
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			/**
			* @provides javelin-behavior-differential-user-select
			* @requires javelin-behavior
			* javelin-dom
			* javelin-stratcom
			*/

			JX.behavior('differential-user-select', function() {

			var unselectable;

			function isOnRight(node) {
			return node.previousSibling &&
			node.parentNode.firstChild != node.previousSibling;
			}

			JX.Stratcom.listen(
			'mousedown',
			null,
			function(e) {
			var key = 'differential-unselectable';
			if (unselectable) {
			JX.DOM.alterClass(unselectable, key, false);
			}
			var diff = e.getNode('differential-diff');
			var td = e.getNode('tag:td');
			if (diff && td && isOnRight(td)) {
			unselectable = diff;
			JX.DOM.alterClass(diff, key, true);
			}
			});

			});

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