[clang-tools-extra] [clang-tidy] Enhance modernize-use-starts-ends-with to handle substr patterns (PR #116033)

[Julian Schmidt via cfe-commits]

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@@ -171,10 +182,26 @@ void UseStartsEndsWithCheck::registerMatchers(MatchFinder *Finder) {
                              hasRHS(lengthExprForStringNode("needle")))))
           .bind("expr"),
       this);
+
+  // Case 6: X.substr(0, LEN(Y)) [!=]= Y -> ends_with.
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5chmidti wrote:

`ends_with` -> `starts_with`. The `substr` is always anchored at `0`

https://github.com/llvm/llvm-project/pull/116033