List Optimize fixed: #4905

[nikogu]

fixed: #4905 (comment)

[nikogu]

这下应该好了 =。-

[codecov]

Codecov Report

Merging #7853 into antd-3.0 will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           antd-3.0    #7853   +/-   ##
=========================================
  Coverage     83.08%   83.08%           
=========================================
  Files           219      219           
  Lines          4429     4429           
  Branches       1334     1334           
=========================================
  Hits           3680     3680           
  Misses          749      749

Impacted Files	Coverage Δ
components/list/index.tsx	91.66% <ø> (+2.08%)	⬆️
components/button/button.tsx	86.95% <0%> (-1.45%)	⬇️

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