Function drag

test/jasmine/tests/updatemenus_test.js:1345–1356

(node, x, y, deltaX, deltaY)

    }

    function drag(node, x, y, deltaX, deltaY) {
        node.dispatchEvent(new MouseEvent('mousedown', {
            bubbles: true,
            clientX: x,
            clientY: y
        }));
        node.dispatchEvent(new MouseEvent('mousemove', {
            bubbles: true,
            clientX: x + deltaX,
            clientY: y + deltaY
        }));
    }

    function dragScrollBox(node, deltaX, deltaY) {
        var position = getCenter(node);