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

Merging #368 (af68058) into master (8085da9) will decrease coverage by 0.20%.
The diff coverage is 33.33%.

@@            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     

Impacted Files	Coverage Δ
src/SubPopupMenu.tsx	95.29% <33.33%> (-1.12%)	⬇️

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[afc163]

Test case is needed.