[clang-format] Break the line within ObjC @selector (llvm#164674)

after, with style `{ColumnLimit: 60}`

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

before

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

Fixes llvm#164574.

The stuff inside the parentheses got a new type in 2a05904. I
neglected to add it to the logic for breaking lines.

Author: sstwcw

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;

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;