Fall back to case sensitive comparisons if case-insensitive is a match

[sharwell]

Fixes #2336

[codecov]

Codecov Report

Merging #2486 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2486      +/-   ##
==========================================
+ Coverage   97.28%   97.28%   +<.01%     
==========================================
  Files         735      735              
  Lines       95467    95502      +35     
  Branches     3473     3474       +1     
==========================================
+ Hits        92877    92912      +35     
  Misses       1748     1748              
  Partials      842      842

Impacted Files	Coverage Δ
...rs/StyleCop.Analyzers/Helpers/NameSyntaxHelpers.cs	75.51% <100%> (+6.27%)	⬆️
...singStaticDirectivesMustBeOrderedAlphabetically.cs	100% <100%> (ø)	⬆️
...OrderingRules/UsingCodeFixProvider.UsingsSorter.cs	88.12% <100%> (ø)	⬆️
...op.Analyzers.Test/OrderingRules/SA1210UnitTests.cs	100% <100%> (ø)	⬆️
...irectivesMustBeOrderedAlphabeticallyByNamespace.cs	100% <100%> (ø)	⬆️

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