[clang] unrecognized html tag causing undesirable comment lexing. fixes llvm#32680

Author: Brock Denson

clang/docs/ReleaseNotes.rst

@@ -195,6 +195,7 @@ Bug Fixes to AST Handling
 - Fix incorrect name qualifiers applied to alias CTAD. (#GH136624)
 - Fixed ElaboratedTypes appearing within NestedNameSpecifier, which was not a
   legal representation. This is fixed because ElaboratedTypes don't exist anymore. (#GH43179) (#GH68670) (#GH92757)
+- Fix unrecognized html tag causing undesirable comment lexing (#GH152944)
 
 Miscellaneous Bug Fixes
 ^^^^^^^^^^^^^^^^^^^^^^^

clang/include/clang/AST/CommentHTMLTags.td

@@ -52,6 +52,10 @@ def Tr      : Tag<"tr"> { let EndTagOptional = 1; }
 def Th      : Tag<"th"> { let EndTagOptional = 1; }
 def Td      : Tag<"td"> { let EndTagOptional = 1; }
 def Summary : Tag<"summary">;
+def Details : Tag<"details">;
+def Mark    : Tag<"mark">;
+def Figure  : Tag<"figure">;
+def FigCaption : Tag<"figcaption">;
 
 // Define a list of attributes that are not safe to pass through to HTML
 // output if the input is untrusted.

clang/test/AST/ast-dump-comment.cpp

@@ -139,4 +139,4 @@ int Test_HTMLSummaryTag(int Aaa);
 // CHECK-NEXT:    ParagraphComment
 // CHECK:           HTMLStartTagComment{{.*}} Name="summary"
 // CHECK-NEXT:        TextComment{{.*}} Text="Short summary"
-// CHECK-NEXT:        HTMLEndTagComment{{.*}} Name="summary"
+// CHECK-NEXT:        HTMLEndTagComment{{.*}} Name="summary"