[clang] [clang-format] Fix a bug in annotating angles containing FatArrow (PR #108671)

[Emilia Kond via cfe-commits]

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@@ -243,14 +244,16 @@ class AnnotatingParser {
       // operator that was misinterpreted because we are parsing template
       // parameters.
       // FIXME: This is getting out of hand, write a decent parser.
-      if (InExpr && !Line.startsWith(tok::kw_template) &&
+      if (InExpr && !SeenFatArrow && !Line.startsWith(tok::kw_template) &&
           Prev.is(TT_BinaryOperator)) {
         const auto Precedence = Prev.getPrecedence();
         if (Precedence > prec::Conditional && Precedence < prec::Relational)
           return false;
       }
       if (Prev.isOneOf(tok::question, tok::colon) && !Style.isProto())
         SeenTernaryOperator = true;
+      else if (Prev.is(TT_FatArrow))
----------------
rymiel wrote:

> If they were to just change handling of ternary expressions, but they changed behavior for expressions that don't have ? in them, it sounds like an unintended change.

All these template edge-cases weren't being represented in testing. My change broke no tests, but it caused a lot of fallout in the issues. I regret making that change, but by now it's too late. I'm sorry

https://github.com/llvm/llvm-project/pull/108671