[clang-format] Handle template opener/closer in braced list (llvm#112494)

Fixes llvm#112487.

(cherry picked from commit 67f576f)

Author: owenca

clang/lib/Format/UnwrappedLineParser.cpp

@@ -2500,6 +2500,11 @@ bool UnwrappedLineParser::parseBracedList(bool IsAngleBracket, bool IsEnum) {
       // Assume there are no blocks inside a braced init list apart
       // from the ones we explicitly parse out (like lambdas).
       FormatTok->setBlockKind(BK_BracedInit);
+      if (!IsAngleBracket) {
+        auto *Prev = FormatTok->Previous;
+        if (Prev && Prev->is(tok::greater))
+          Prev->setFinalizedType(TT_TemplateCloser);
+      }
       nextToken();
       parseBracedList();
       break;

clang/unittests/Format/TokenAnnotatorTest.cpp

@@ -3404,6 +3404,12 @@ TEST_F(TokenAnnotatorTest, TemplateInstantiation) {
   ASSERT_EQ(Tokens.size(), 21u) << Tokens;
   EXPECT_TOKEN(Tokens[4], tok::less, TT_TemplateOpener);
   EXPECT_TOKEN(Tokens[16], tok::greater, TT_TemplateCloser);
+
+  Tokens =
+      annotate("auto x{std::conditional_t<T::value == U::value, T, U>{}};");
+  ASSERT_EQ(Tokens.size(), 24u) << Tokens;
+  EXPECT_TOKEN(Tokens[6], tok::less, TT_TemplateOpener);
+  EXPECT_TOKEN(Tokens[18], tok::greater, TT_TemplateCloser);
 }
 
 } // namespace