[clang] [clang-format] Handle Trailing Whitespace After Line Continuation (P2223R2) (PR #145243)

[Owen Pan via cfe-commits]

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@@ -1025,6 +1025,9 @@ clang-format
   ``enum`` enumerator lists.
 - Add ``OneLineFormatOffRegex`` option for turning formatting off for one line.
 - Add ``SpaceAfterOperatorKeyword`` option.
+- Support trailing whitespace in line splicing.
+  (P2223R2 <https://www.open-std.org/jtc1/sc22/wg21/docs/papers/2021/p2223r2.pdf>_, #GH145226)
+
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owenca wrote:

Usually, we update the release notes for new top-level options only. I'd leave this file unchanged.

https://github.com/llvm/llvm-project/pull/145243