'filtered' eventlistener is fired twice when "Others" is clicked in rowChart

[medigvijay]

I have a rowChart and using rowsCap to show rest(i.e. other than top five) of the filters as "Others".
But when I click on the "Others" row the "filtered" listener is fired twice instead of once.
I understand that it adds "Others" to filters, but from a users point of view I don't expect the listener to be fired twice.

chart.on("filtered", function(chart, filter) { console.log(filter); // twice first the array and secondly the "Others" }

[gordonwoodhull]

Good question. The reason is that in the cap mixin, it is separately handling filtering all of the individual keys of the Others, and filtering the Others key itself. So it filters twice.

https://github.com/dc-js/dc.js/blob/master/src/cap-mixin.js#L101

If you say, "wait, that seems kind of inefficient; doesn't that mean it's recalculating the crossfilter twice?" Well yes, it is, and the same lack of expressivity in the filter primitives is present in a few other places (as well as in custom filter behaviors).

#716 should fix this.