[clang] [clang-format] Add ShortReturnTypeLength option. (PR #78011)

[via cfe-commits]

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@@ -3928,6 +3928,13 @@ struct FormatStyle {
   /// \version 13
   unsigned ShortNamespaceLines;
 
+  /// When AlwaysBreakAfterReturnType is None, line breaks are prevented after
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rmarker wrote:

Done.

https://github.com/llvm/llvm-project/pull/78011