[clang] [clang-format] Break the line within `@selector` (PR #164674)

[via cfe-commits]

https://github.com/sstwcw created https://github.com/llvm/llvm-project/pull/164674

after, with style `{ColumnLimit: 60}`

```Objective-C
[objectName
    respondsToSelector:
        @selector(
            somelonglonglonglongnameeeeeeee:
            loooooooooanotherlonglonglonglongnametopush:
            otherlongnameforlimit:)];
```

before

```Objective-C
[objectName
    respondsToSelector:
        @selector(
            somelonglonglonglongnameeeeeeee:loooooooooanotherlonglonglonglongnametopush:otherlongnameforlimit:)];
```

Fixes #164574.

The stuff inside the parentheses got a new type in 2a059042882ed.  I neglected to add it to the logic for breaking lines.

>From 1910a65e37e87b262f5900a624f193e314fec4af Mon Sep 17 00:00:00 2001
From: sstwcw <su3e8a96kzlver at posteo.net>
Date: Wed, 22 Oct 2025 17:48:29 +0000
Subject: [PATCH] [clang-format] Break the line within `@selector`

after, with style `{ColumnLimit: 60}`

```Objective-C
[objectName
    respondsToSelector:
        @selector(
            somelonglonglonglongnameeeeeeee:
            loooooooooanotherlonglonglonglongnametopush:
            otherlongnameforlimit:)];
```

before

```Objective-C
[objectName
    respondsToSelector:
        @selector(
            somelonglonglonglongnameeeeeeee:loooooooooanotherlonglonglonglongnametopush:otherlongnameforlimit:)];
```

Fixes #164574.

The stuff inside the parentheses got a new type in 2a059042882ed.  I
neglected to add it to the logic for breaking lines.
---
 clang/lib/Format/TokenAnnotator.cpp       | 12 +++++++++---
 clang/unittests/Format/FormatTestObjC.cpp |  6 ++++++
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index c97a9e81eb59e..1d0dfd0b9c151 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -4407,8 +4407,12 @@ unsigned TokenAnnotator::splitPenalty(const AnnotatedLine &Line,
   // breaking after it.
   if (Right.is(TT_SelectorName))
     return 0;
-  if (Left.is(tok::colon) && Left.is(TT_ObjCMethodExpr))
-    return Line.MightBeFunctionDecl ? 50 : 500;
+  if (Left.is(tok::colon)) {
+    if (Left.is(TT_ObjCMethodExpr))
+      return Line.MightBeFunctionDecl ? 50 : 500;
+    if (Left.is(TT_ObjCSelector))
+      return 500;
+  }
 
   // In Objective-C type declarations, avoid breaking after the category's
   // open paren (we'll prefer breaking after the protocol list's opening
@@ -6291,7 +6295,9 @@ bool TokenAnnotator::canBreakBefore(const AnnotatedLine &Line,
                      TT_BitFieldColon)) {
     return false;
   }
-  if (Left.is(tok::colon) && Left.isOneOf(TT_DictLiteral, TT_ObjCMethodExpr)) {
+  if (Left.is(tok::colon) && Left.isOneOf(TT_ObjCSelector, TT_ObjCMethodExpr))
+    return true;
+  if (Left.is(tok::colon) && Left.is(TT_DictLiteral)) {
     if (Style.isProto()) {
       if (!Style.AlwaysBreakBeforeMultilineStrings && Right.isStringLiteral())
         return false;
diff --git a/clang/unittests/Format/FormatTestObjC.cpp b/clang/unittests/Format/FormatTestObjC.cpp
index 700d7cf8efca6..cf8143ace7b45 100644
--- a/clang/unittests/Format/FormatTestObjC.cpp
+++ b/clang/unittests/Format/FormatTestObjC.cpp
@@ -949,6 +949,12 @@ TEST_F(FormatTestObjC, FormatObjCMethodExpr) {
       "[aaaaaaaaaaaaaaaaaaaaaaaaa\n"
       "    aaaaaaaaaaaaaaaaa:aaaaaaaa\n"
       "                  aaa:aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa];");
+  verifyFormat("[objectName\n"
+               "    respondsToSelector:\n"
+               "        @selector(\n"
+               "            somelonglonglonglongnameeeeeeee:\n"
+               "            loooooooooanotherlonglonglonglongnametopush:\n"
+               "            otherlongnameforlimit:)];");
 
   Style = getChromiumStyle(FormatStyle::LK_ObjC);
   Style.ColumnLimit = 80;