make sure startIndex <= endIndex when measuring visible tabs

[rinick]

resolves issue: #444

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[codecov[bot]]

Codecov Report

Merging #454 (7038242) into master (3aeba5a) will decrease coverage by 0.17%. The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #454      +/-   ##
==========================================
- Coverage   99.47%   99.30%   -0.18%     
==========================================
  Files          13       13              
  Lines         570      572       +2     
  Branches      143      144       +1     
==========================================
+ Hits          567      568       +1     
- Misses          3        4       +1     

Impacted Files	Coverage Δ
src/hooks/useVisibleRange.ts	97.14% <50.00%> (-2.86%)	:arrow_down:

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[afc163]

Could you add a test case?