Optimize node ancestor checks

[tvasenin]

Eliminate String.split() and compare position strings directly.

Gives huge performance boost when handling lots of nodes, e.g.
https://react-component.github.io/tree-select/examples/big-data.html

[codecov-io]

Codecov Report

Merging #84 into master will increase coverage by 0.58%.
The diff coverage is 50%.

@@            Coverage Diff             @@
##           master      #84      +/-   ##
==========================================
+ Coverage   81.86%   82.44%   +0.58%     
==========================================
  Files           7        7              
  Lines         623      621       -2     
  Branches      195      194       -1     
==========================================
+ Hits          510      512       +2     
+ Misses        110      106       -4     
  Partials        3        3

Impacted Files	Coverage Δ
src/Select.jsx	79.36% <0%> (+0.77%)	⬆️
src/util.js	95.65% <100%> (+0.19%)	⬆️

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[yesmeck]

Thanks!

[tvasenin]

@yesmeck I see that a new version of tree component (v1.7.9) has already been uploaded to NPM.

Could you, please, also release new tree-select component?

[yesmeck]

Released 1.12.1

[tvasenin]

@yesmeck could you please, also bump rc-tree dependency (and release new rc-tree-select version with fixed dependency)?
Should be "rc-tree": "~1.7.9" (version with performance fix) instead of "rc-tree": "~1.7.1".

[yesmeck]

rc-tree-select will use rc-tree@1.7.9 if you reinstall it ?

[tvasenin]

Yes, npm update rc-tree-select updates latest rc-tree too.

Still, for some reason, the example page uses old rc-tree dependency for some reason:
https://react-component.github.io/tree-select/examples/big-data.html

Thus, I assume, the safest way would be to declare the minimum required version explicitly.

[yesmeck]

I'v just updated the example pages.