lower level triggerSubMenuAction wins over upper level triggerSubMenuAction

[llambanna]

to cater for scenario where top level items are click and sub menus are hover - similar to google docs menu UX

[codecov]

Codecov Report

❌ Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 95.53%. Comparing base (8085da9) to head (af68058).
⚠️ Report is 204 commits behind head on master.

Files with missing lines	Patch %	Lines
src/SubPopupMenu.tsx	33.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #368      +/-   ##
==========================================
- Coverage   95.73%   95.53%   -0.21%     
==========================================
  Files          11       11              
  Lines         915      918       +3     
  Branches      271      274       +3     
==========================================
+ Hits          876      877       +1     
- Misses         39       40       +1     
- Partials        0        1       +1     

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[afc163]

Test case is needed.