Fix GUI bug for Find command

[yongkotaro]

• Closes GUI shows grey boxes for find command #87
• ResultDisplay does not have inner rectangle

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.75%. Comparing base (2cfee46) to head (86462c8).
Report is 6 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master      #88      +/-   ##
============================================
+ Coverage     77.53%   77.75%   +0.22%     
- Complexity      511      524      +13     
============================================
  Files            82       84       +2     
  Lines          1589     1641      +52     
  Branches        156      162       +6     
============================================
+ Hits           1232     1276      +44     
- Misses          313      315       +2     
- Partials         44       50       +6     

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[wang-xinrong]

LGTM!