Rangeslider only shows for the first x-axis in multiple subplots

[hy9be]

For example in case here: http://codepen.io/plotly/pen/648434b7b06688fc6b00067592d616b0.

If I add rangeslider: {} to xaxis2, no slider will be rendered.
If I add rangeslider: {} to both xaxis and xaxis2, only the first x-axis will have the slider.

It seems the range slider will not work for some of the axes in subplots.

[hy9be]

@etpinard Is this a bug or an expected behavior? I read the spec for rangeslider here: #279, but did not find a clue.

Thanks!

[etpinard]

It is the expected behavior (for now). Would be a nice addition though.

[hy9be]

Thanks!. I would like to try to make a PR for this.

I see that there is a flag named isMainPlot in the drawing function for rangeslider: https://github.com/plotly/plotly.js/blob/master/src/components/rangeslider/draw.js#L334

Not sure if this is key flag for this.