do not expand tree after clear the input

[exonuclease]

I find that all nodes are expanded when starting the search.And In some cases
this component will request the api for many times.

1. Load data asynchronously.
2. Search the nodes.
3. Some nodes match the search string.
4. Press backspace to delete all search text.
   If some one need help to reproduce the problem please contact with me.

[codecov-io]

Codecov Report

Merging #132 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #132   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines         226    226           
  Branches       44     44           
=====================================
  Hits          226    226

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[zombieJ]

This may not fix all related loadData issue. We should make the TreeSelect not call loadData when searching and set expandedKeys back instead of just reset to [] when search input clear:

[exonuclease]

Yes I think your idea is better.I just provide a temporary solution.

[zombieJ]

Yes I think your idea is better.I just provide a temporary solution.

👌, Let me handle this : )