fix(Cascader): cascader props value changed then expandedValue did no…

[seven-lh]

close #3954

[seven-lh]

cascader props value expanded Value

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (4fc9f0e) 90.77% compared to head (645fe48) 90.91%.
Report is 8 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4531      +/-   ##
==========================================
+ Coverage   90.77%   90.91%   +0.13%     
==========================================
  Files         305      305              
  Lines       17905    17935      +30     
  Branches     5291     5305      +14     
==========================================
+ Hits        16253    16305      +52     
+ Misses       1635     1613      -22     
  Partials       17       17              

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[eternalsky]

@YSMJ1994 这个 pr 解决的 issue，貌似与另一个 pr 有些关联：c8ed0b5 。可以一起来看一下。另一个 pr 中，加入了 state.isExpandedValueSetByAction 限制了根据值重置 expandedValue 的逻辑，而这个 pr 关联的 issue 貌似就是这个的反例，即value 变化从外部而外，但 isExpandedValueSetByAction 并未改变，导致 expandedValue 没有重置。