colorbar draws outside the bounds

Hey Plotly team,

Small bug - sometimes, depending on the layout’s height/vertical margins, one of the colorbar’s .cbfill will get drawn outside the outline (see http://codepen.io/hellochar/pen/JREjyv):

Looks like it’s only off by 1 pixel:

It is a noticeable artifact that sometimes appears in our charts. Any ideas what’s going on here? Happy to submit a PR as well if someone could help me understand the code at https://github.com/plotly/plotly.js/blob/master/src/components/colorbar/draw.js#L348

Thanks, Xiaohan

[alexcjohnson]

possibly - crispEdges is what I was going to do to fix the other part of this anyway - just worried that this will lead to other instances where the line gets completely deleted too - typically that’s even easier to do crisp than non-crisp.

[alexcjohnson]

@etpinard pointed out this issue when I mentioned a related one during #1906, so I might as well combine them and tackle them simultaneously:

we’re not doing crisp rendering of colorbars - particularly the outlines, but line levels should probably be crisp too