Use scrollWidth/Height instead of offsetWidth/Height.

[abramobagnara]

This fixes the computation of size for div.ant-tabs-nav

[coveralls]

Coverage increased (+0.1%) to 70.295% when pulling 46f7556 on abramobagnara:master into 242b577 on react-component:master.

[afc163]

What is this fix for?

[abramobagnara]

Without this patch the sizes used does not take in account the possibility that the measured elements are constrained by a scrollbar, then leading to incorrect presentation.

[afc163]

Could you provide a reproducible demo for it?

[abramobagnara]

This is the reproducible demo:
https://codepen.io/afc163/pen/eyRONw?editors=1010

After a few uses of + button you will see that the bar does not show navigation buttons.

[abramobagnara]

Do you confirm the issue and the misuse of offsetWidth/offsetHeight?

[paranoidjk]

close #84

[paranoidjk]

@abramobagnara Yep, i confirmed it'a a bug. Could you rebase master to resolve confict?

[coveralls]

Coverage remained the same at 68.815% when pulling f26ee57 on abramobagnara:master into 7f78a16 on react-component:master.

[abramobagnara]

Just rebased.

[benjycui]

ping~

[coveralls]

Coverage remained the same at 61.407% when pulling 0aa3c63 on abramobagnara:master into 8802ea9 on react-component:master.

[abramobagnara]

Just done a new rebase.

[paranoidjk]

@zhang740 Request for review, if it's ok, bump a patch version

It's used by PC.