Function userUnselect

static/editor.md/editormd.js:4466–4470

(obj)

            };

            var userUnselect = function (obj) {
                obj.addClass(classPrefix + "user-unselect").on("selectstart", function(event) { // selectstart for IE                        
                    return false;
                });
            };

            var moveAction = function (e) {
                e = e || window.event;  //IE