[clang] [clang-format] Fix wrapping before ##__VA_ARGS__ macro arguments (PR #214105)

[Björn Schäpers via cfe-commits]

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@@ -6511,8 +6511,14 @@ bool TokenAnnotator::canBreakBefore(const AnnotatedLine &Line,
             !(Right.Next &&
               Right.Next->isOneOf(TT_FunctionDeclarationName, tok::kw_const)));
   }
-  if (Left.is(tok::hashhash) || Right.is(tok::hashhash))
+  // Keep pasted tokens together, except for the GNU comma elision extension,
+  // where the comma is also an argument separator and remains a useful break
+  // point before ##__VA_ARGS__.
+  if ((Left.is(tok::hashhash) || Right.is(tok::hashhash)) &&
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HazardyKnusperkeks wrote:

This is hard to read. Maybe it's simpler to split `Left.is(tok::hashhash)` and `Right.is(tok::hashhash)` into two `if`s?

https://github.com/llvm/llvm-project/pull/214105