[clang-format] Fix a regression in annotating class decl braces (#93657)

Fixes #93604.

Author: owenca

clang/lib/Format/UnwrappedLineParser.cpp

@@ -4026,6 +4026,9 @@ void UnwrappedLineParser::parseRecord(bool ParseAsExpr) {
       if (AngleNestingLevel == 0) {
         if (FormatTok->is(tok::colon)) {
           IsDerived = true;
+        } else if (FormatTok->is(tok::identifier) &&
+                   FormatTok->Previous->is(tok::coloncolon)) {
+          ClassName = FormatTok;
         } else if (FormatTok->is(tok::l_paren) &&
                    IsNonMacroIdentifier(FormatTok->Previous)) {
           break;

clang/unittests/Format/TokenAnnotatorTest.cpp

@@ -2914,6 +2914,11 @@ TEST_F(TokenAnnotatorTest, BraceKind) {
   EXPECT_BRACE_KIND(Tokens[5], BK_Block);
   EXPECT_BRACE_KIND(Tokens[6], BK_Block);
 
+  Tokens = annotate("struct Foo<int>::Bar {};");
+  ASSERT_EQ(Tokens.size(), 11u) << Tokens;
+  EXPECT_BRACE_KIND(Tokens[7], BK_Block);
+  EXPECT_BRACE_KIND(Tokens[8], BK_Block);
+
   Tokens = annotate("struct Foo<int> : Base {};");
   ASSERT_EQ(Tokens.size(), 11u) << Tokens;
   EXPECT_BRACE_KIND(Tokens[7], BK_Block);