[clang] [clang-format] Fix operator overload inconsistency in `BreakAfterAttributes: Always` (PR #74943)

[via cfe-commits]

https://github.com/XDeme created https://github.com/llvm/llvm-project/pull/74943

Fixes llvm/llvm-project#74901

>From b80f8579dbc745ddfaa3d60770dd0d3e79e6c641 Mon Sep 17 00:00:00 2001
From: XDeme <fernando.tagawa.gamail....@gmail.com>
Date: Sat, 9 Dec 2023 14:31:12 -0300
Subject: [PATCH] Fixes overload operator in BreakAfterAttributes

---
 clang/lib/Format/ContinuationIndenter.cpp |  3 ++-
 clang/unittests/Format/FormatTest.cpp     | 14 ++++++++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/clang/lib/Format/ContinuationIndenter.cpp 
b/clang/lib/Format/ContinuationIndenter.cpp
index 9e4e939503dfe4..de3768d475e7b2 100644
--- a/clang/lib/Format/ContinuationIndenter.cpp
+++ b/clang/lib/Format/ContinuationIndenter.cpp
@@ -593,7 +593,8 @@ bool ContinuationIndenter::mustBreak(const LineState 
&State) {
         // name.
         !Style.isJavaScript()) ||
        (Current.is(tok::kw_operator) && Previous.isNot(tok::coloncolon))) &&
-      Previous.isNot(tok::kw_template) && CurrentState.BreakBeforeParameter) {
+      Previous.isNot(tok::kw_template) && CurrentState.BreakBeforeParameter &&
+      (Style.isCpp() && Current.Tok.isNot(tok::kw_operator))) {
     return true;
   }
 
diff --git a/clang/unittests/Format/FormatTest.cpp 
b/clang/unittests/Format/FormatTest.cpp
index 24b2fd599dc397..a1f3beed475ff3 100644
--- a/clang/unittests/Format/FormatTest.cpp
+++ b/clang/unittests/Format/FormatTest.cpp
@@ -26417,6 +26417,20 @@ TEST_F(FormatTest, BreakAfterAttributes) {
                "void g() {}",
                CtorDtorCode, Style);
 
+  Style.ReferenceAlignment = FormatStyle::ReferenceAlignmentStyle::RAS_Left;
+  constexpr StringRef OperatorOverloadCode(
+      "struct Foo {\n"
+      "[[maybe_unused]] void operator+();\n"
+      "};\n"
+      "[[nodiscard]] Foo& operator-(Foo&);");
+  verifyFormat("struct Foo {\n"
+               "  [[maybe_unused]]\n"
+               "  void operator+();\n"
+               "};\n"
+               "[[nodiscard]]\n"
+               "Foo& operator-(Foo&);",
+               OperatorOverloadCode, Style);
+
   Style.BreakBeforeBraces = FormatStyle::BS_Linux;
   verifyFormat("struct Foo {\n"
                "  [[deprecated]]\n"

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