Backport #1891 to v0.4

[kt3k]

closes #2420

[codecov-io]

Codecov Report

Merging #2421 into v0.4 will increase coverage by 0.89%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##             v0.4    #2421      +/-   ##
==========================================
+ Coverage   75.04%   75.93%   +0.89%     
==========================================
  Files          51       51              
  Lines        4247     4247              
==========================================
+ Hits         3187     3225      +38     
+ Misses       1060     1022      -38

Impacted Files	Coverage Δ
src/shape.line.js	70.69% <100%> (ø)	⬆️
src/api.focus.js	100% <0%> (+8.57%)	⬆️
src/arc.js	85.96% <0%> (+12.28%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 6b9299f...60351ba. Read the comment docs.