tooltip order not working

The tooltip argument to ggplotly does not seem to change the order of tooltips. For example with

ggiris <- qplot(Petal.Width, Sepal.Length, data = iris, color = Species)
ggplotly(ggiris, tooltip = c("y", "x", "colour"))

I see a tooltip with order Species, Petal.Width, Sepal.Length, i.e. color, x, y.

Using ggplot 2.2.1 and plotly 4.5.6 with R 3.3.2 on Mac OS X.

使用提供的 qplot 和 ggplotly 示例重现该问题，然后跟踪 tooltip 参数的处理方式。完成的标准是 tooltip 字段按请求的 y、x、colour 顺序显示，而不是按 colour、x、y 顺序显示。