fix: improve findSearchMatch to fix whitespace matching errors #6816
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Description
There were previously incorrect ranges being returned in cases where we had to fall back to the whitespace matcher, mangling files. This tests that further and addresses the problems.
Checklist
Tests
Primarily this PR creates additional tests to check each of the fallback methods
Summary by cubic
Fixed incorrect whitespace matching in findSearchMatch, preventing file mangling and improving accuracy for edge cases.