Rebasing region label work from PR 1853

[dunderpate]

Hi @panthony, here's an updated patch for PR #1853.

The tests failed due to something seemingly unrelated (legend padding), and the same failure was also occurring on master. Apart from that, everything else seemed to work fine. Feel free to let me know if there's anything amiss and I'll be happy to fix it.

Thanks @panthony!

[codecov-io]

Codecov Report

Merging #2703 into master will increase coverage by 0.04%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2703      +/-   ##
==========================================
+ Coverage   82.68%   82.72%   +0.04%     
==========================================
  Files          59       59              
  Lines        4718     4735      +17     
==========================================
+ Hits         3901     3917      +16     
- Misses        817      818       +1

Impacted Files	Coverage Δ
src/region.js	91.8% <100%> (+3.16%)	:arrow_up:
src/core.js	90.74% <0%> (-0.16%)	:arrow_down:

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[panthony]

@dunderpate Ideally we should document those new options in the reference.

And if this could be greenlighted by @kt3k that would be awesome 👍

[dunderpate]

@panthony, thanks for the review. I'll take a stab at updating the reference documentation.

[dunderpate]

Right on, ready for a review of the documentation when you have time @panthony. Thanks!

[panthony]

@dunderpate Looks good! Thanks!

[dunderpate]

Right on, thanks @panthony!